Customizing biblatex

Question

I have problems customizing my own biblatex style. It should look like that:

I tried it over the weekend after reading manual and post. I thought that it would be easier to customize an already existing style (in my example the authortitle style) but maybe it would be easier to create a new one. But I only get errors and I'm quite under time pressure with the deadline so I hope someone can help me out.

EDIT: Things that need to be changed:

Generally:

1. date format: dd.mm.yyyy.

Article:

1. remove "In:"
2. title of journal, year, issue number, (all in italics) page number.

Oral(Interview):

1. show interviewer
2. add before interviewer's name: Interview: [interviewer's name]
3. date, address.

Electronic:

1. title in quotations mark and not in italics
2. Remove "URL:"
3. Remove brackets around "last visited at"
4. show institution

I add a MWE and one of my many approaches to customize the authortitle style (the approach will be quite useless).

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[style=authortitle]{biblatex}
\usepackage[ngerman]{babel}

\usepackage{filecontents}

\begin{filecontents}{test.bib}
@article{article,
    author  = {Peter Adams}, 
    title   = {The title of the work},
    journal = {The name of the journal},
    year    = 1993,
    number  = 2,
    pages   = {201-213},
}

@book{book,
    author    = {Peter Babington}, 
    title     = {The title of the work},
    address = {Berlin},
    year      = 1993,
}

@Oral{dean,
  author      = {Dean Rusk},
  interviewer = {David O'Brian},
  date        = {21.08.1970},
  year        = {1970},
  address     = {Boston},
}

@Electronic{pan,
  author      = Phlip Pan
  institution = {The New York Times},
  date        = {118.11.2018},
  year        = {2016},
  title       = {The West was sure the Chinese approach would not work. It 
   just had to wait. It's still waiting.},
  url         = 
  {https://www.nytimes.com/interactive/2018/11/18/world/asia/china- 
  rules.html},
  urldate     = {18.11.2018},
}
\end{filecontents}

\addbibresource{test.bib}

\begin{document}
Some famous linguists wrote a couple of books  \cite{article} \cite{book} 


\printbibliography
\end{document}

Answer 1

Questions asking to implement an entire style are always a bit hard to answer and take a lot of time, it is usually a much better idea to ask about specific features of the style. The compartmentalised nature of biblatex styles usually allows for an easy combination of answers (and should that not be the case it is always possible to ask a new follow-up question about combining two answers). In the last couple of days there was a series of questions that seemed to work towards building the style shown here, so I thought I'd collect the answers here to make sure this question has an answer.

Firstly, there are a few syntax errors in your .bib file. Dates in date fields must be given in ISO 8601/EDTF format (yyyy-mm-dd), so urldate = {18.11.2018}, is wrong, it should be urldate = {2018-11-18}, instead. That should immediately solve the date issue. Though you may want to use the option dateabbrev=false.

Furthermore, there was an issue with the author field in pan, it must be author = {Phlip Pan},.

You should also not give both a year and a date field. date alone should be enough.

• For the "In:" there is the classic Suppress "In:" biblatex.
• I did not find a question for the desired format of journal, date and volume (admittedly I didn't look very hard), so I have thrown something together in the MWE below (the block with journal+issuetitle).
• An implementation of the @interview type can be found in Create interview bibliography type with biblatex and Custom type disappears in subsequent citations, though a few changes are needed for the authortitle citation style.
• The necessary modifications for @online can be found in gusbrs' answer to Sort authors and organizations alphabetically and in Move date before title in bibliography using biblatex as well as Add a point after the URL with biblatex. Note that we use organization instead of institution, see Show institution with biblatex.

We end up with

\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{article,
  author  = {Peter Adams}, 
  title   = {The title of the work},
  journal = {The name of the journal},
  year    = 1993,
  number  = 2,
  pages   = {201-213},
}
@book{book,
  author    = {Peter Babington}, 
  title     = {The title of the work},
  address   = {Berlin},
  year      = 1993,
}
@interview{dean,
  interviewee = {Dean Rusk},
  interviewer = {David O'Brian},
  date        = {1970-08-21},
  address     = {Boston},
}
@online{pan,
  author       = {Phlip Pan},
  organization = {The New York Times},
  date         = {2018-11-18},
  title        = {The West was sure the Chinese approach would not work.
                  It just had to wait. It's still waiting.},
  url          = {https://www.nytimes.com/interactive/2018/11/18/world/asia/china-rules.html},
  urldate      = {2018-11-18},
}
\end{filecontents}
\begin{filecontents}{interview.dbx}
\DeclareDatamodelEntrytypes{interview}
\DeclareDatamodelFields[type=list,datatype=name]{
  interviewer,
  interviewee,
}

\DeclareDatamodelEntryfields[interview]{
  addendum,
  doi,
  eprint,
  eprintclass,
  eprinttype,
  interviewer,
  interviewee,
  location,
  note,
  pubstate,
}
\end{filecontents}
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[german=swiss]{csquotes}
\usepackage[backend=biber, datamodel=interview, style=authortitle, dateabbrev=false]{biblatex}

% https://tex.stackexchange.com/q/10682/35864
\renewbibmacro{in:}{%
  \ifentrytype{article}{}{\printtext{\bibstring{in}\intitlepunct}}}

\DeclareFieldFormat[article,periodical]{date}{\mkbibemph{#1}}
\DeclareFieldFormat[article,periodical]{volume}{\mkbibemph{#1}}
\DeclareFieldFormat[article,periodical]{number}{\mkbibemph{#1}}
\renewbibmacro*{journal+issuetitle}{%
  \usebibmacro{journal}%
  \setunit*{\addcomma\space}%
  \iffieldundef{series}
    {}
    {\newunit
     \printfield{series}%
     \setunit{\addcomma\space}}%
  \usebibmacro{date}%
  \setunit{\addcomma\space}%
  \usebibmacro{volume+number+eid}%
  \setunit{\addcolon\space}%
  \usebibmacro{issue}%
  \newunit}

\DeclareFieldFormat[article,periodical]{pages}{#1}

% https://tex.stackexchange.com/q/464756/35864
\NewBibliographyString{interview}
\DefineBibliographyStrings{german}{%
  interview   = {Interview},
}

\DeclareNameAlias{interviewee}{author}

\DeclareBibliographyDriver{interview}{%
  \usebibmacro{bibindex}%
  \usebibmacro{begentry}%
  \printnames{interviewee}%
  \newunit\newblock
  \bibstring{interview}%
  \setunit{\addspace}%
  \printnames{interviewer}%
  \newunit\newblock
  \printfield{note}%
  \newunit\newblock
  \usebibmacro{location+date}%
  \newunit\newblock
  \usebibmacro{doi+eprint+url}%
  \newunit\newblock
  \usebibmacro{addendum+pubstate}%
  \setunit{\bibpagerefpunct}\newblock
  \usebibmacro{pageref}%
  \newunit\newblock
  \iftoggle{bbx:related}
    {\usebibmacro{related:init}%
     \usebibmacro{related}}
    {}%
  \usebibmacro{finentry}}

\DeclareSortingTemplate{nty}{
  \sort{
    \field{presort}
  }
  \sort[final]{
    \field{sortkey}
  }
  \sort{
    \field{sortname}
    \field{author}
    \field{editor}
    \field{translator}
    \field{interviewee}
    \field{sorttitle}
    \field{title}
  }
  \sort{
    \field{sorttitle}
    \field{title}
  }
  \sort{
    \field{sortyear}
    \field{year}
  }
  \sort{
    \field{volume}
    \literal{0}
  }
}

\DeclareLabelname{%
  \field{shortauthor}
  \field{author}
  \field{shorteditor}
  \field{editor}
  \field{translator}
  \field{interviewee}
}

\renewbibmacro*{cite:title}{%
  \printtext[bibhyperref]{%
    \ifentrytype{interview}
      {\bibstring{interview}%
       \setunit{\addspace}%
       \printnames[family]{interviewer}}
      {\printfield[citetitle]{labeltitle}}}}


% https://tex.stackexchange.com/q/464205/35864
\DefineBibliographyStrings{english}{
  urlseen = {visited at} 
} 



\DeclareFieldFormat[online]{title}{\mkbibquote{#1\isdot}}
\DeclareListWrapperFormat{organization}{\mkbibemph{#1}}

\DeclareFieldFormat{url}{\url{#1}}
\DeclareFieldFormat{urldate}{\bibstring{urlseen}\space#1}

% https://tex.stackexchange.com/q/464383/35864
\renewbibmacro*{url+urldate}{%
  \usebibmacro{url}%
  \iffieldundef{urlyear}
    {}
    {\setunit*{\newunitpunct}%
     \usebibmacro{urldate}}}

\DeclareBibliographyDriver{online}{%
  \usebibmacro{bibindex}%
  \usebibmacro{begentry}%
  \usebibmacro{author/editor+others/translator+others}%
  \newunit\newblock
  \printlist{organization}%
  \newunit\newblock
  \usebibmacro{date}%
  \newunit\newblock
  \usebibmacro{title}%
  \newunit
  \printlist{language}%
  \newunit\newblock
  \usebibmacro{byauthor}%
  \newunit\newblock
  \usebibmacro{byeditor+others}%
  \newunit\newblock
  \printfield{version}%
  \newunit
  \printfield{note}%
  \newunit\newblock
  \iftoggle{bbx:eprint}
    {\usebibmacro{eprint}}
    {}%
  \newunit\newblock
  \usebibmacro{url+urldate}%
  \newunit\newblock
  \usebibmacro{addendum+pubstate}%
  \setunit{\bibpagerefpunct}\newblock
  \usebibmacro{pageref}%
  \newunit\newblock
  \iftoggle{bbx:related}
    {\usebibmacro{related:init}%
     \usebibmacro{related}}
    {}%
  \usebibmacro{finentry}}




\addbibresource{\jobname.bib}

\begin{document}
Lorem  \cite{article} ipsum \cite{book,dean,pan} 
\printbibliography
\end{document}

A few details may be missing, but this should capture the overall feel of the style.