Biblatex + Biber: \citeauthor needs 'and' between authors, \printbibliograpy requires '&' between authors

Question

My university is very strict on the correct formatting of the bibliography.

When quoting in text, these are the guidelines:

• 2 authors = familyname 1 'en' familyname2 year => (Wood en Kroger 2000)
• 3 authors = familyname 1 , familyname 2 'en' familyname3 year=> (Wood , Kroger en Subtle 2000)
• 4 authors or more = familyname 1 et al. year => (Wood et al. 2000)

In the bibliography, for reasons unknow, we have to use & instead of en

• Wood, L. & R. Kroger (2000)
• Wood, L., R. Kroger & L. Subtle (2020)
• Wood, L., R. Kroger, L. Subtle & S. Else (2020)

---

3 questions:

1. how can I differentiate between body = en and bibliography = &.

\DeclareDelimFormat{finalnamedelim}{\addspace\&\space} seems to change ALL ands into &

2. Why is my mincitenames/maxcitenames not kicking in the the MWE below.

~~ begin edit: found this myself ~~

3. How do I get et al. instead of e.a.

\DefineBibliographyStrings{dutch}{%
    andothers = {et\addabbrvspace al\adddot}
}

~~end edit~~

---

MWE

\documentclass[a4paper]{article}
\usepackage[dutch]{babel}               % Nederlands
\usepackage{filecontents}
\begin{filecontents*}{refs.bib}
@book{wood_2,
  title = {2 authors},
  author = {Wood, Linda and Kroger, Rolf},
  date = {2000},
  publisher = {{SAGE Publications}},
  location = {{California}},
  langid = {english}
}

@book{wood_3,
    title = {3 authors},
    author = {Wood, Linda and Kroger, Rolf and Subtle, Loosely},
    date = {2020},
    publisher = {{SAGE Publications}},
    location = {{California}},
    langid = {english}
}

@book{wood_4,
    title = {4 authors},
    author = {Wood, Linda and Kroger, Rolf and Subtle, Loosely and Else, Somebody},
    date = {2020},
    publisher = {{SAGE Publications}},
    location = {{California}},
    langid = {english}
}
\end{filecontents*}
\usepackage[innamebeforetitle=true,
            citestyle=ext-authoryear-comp,  % meerdere auteurs = chronologisch maar gegroepereerd per auteur
            bibstyle=ext-authoryear,
%           style=ext-authoryear-comp,      % meerdere auteurs = chronologisch maar gegroepereerd per auteur
            sortcites,                      % sorteer citaties per jaar,
            sorting=ynt,
            mincitenames=1,
            maxcitenames=3,
            maxbibnames=99,                 % Toon alle auteurs van een boek - https://tex.stackexchange.com/questions/1554/biblatex-displaying-all-authors-of-multi-author-works-in-the-bibliography
            uniquename=init,
            giveninits=true,                % initialen bij voornaam
            doi=false,                      % geen DOI
            isbn=false,                     % geen ISBN
            dashed=false,                   % auteurs moeten altijd voluit geschreven worden, hoe vaak ze ook geciteerd worden
            dateabbrev=false,
            backend=biber]{biblatex}
\addbibresource{refs.bib}

\DeclareDelimFormat{finalnamedelim}{\addspace\&\space}

\begin{document}

2 authors: \citeauthor{wood_2} - \autocite{wood_2}

3 authors: \citeauthor{wood_3} - \autocite{wood_3}

4 authors: \citeauthor{wood_4} - \citeauthor*{wood_4} - \autocite{wood_4}

    \newrefcontext[sorting=nyt]
    \printbibliography
\end{document}

---

Answer 1

You can do this with the following \DeclareDelimFormat commands:

\DeclareDelimFormat[]{finalnamedelim}{\ifnumgreater{\value{liststop}}{3}{\addspace\&\space}{\addspace\bibstring{and}\space}}
\DeclareDelimFormat[bib]{finalnamedelim}{\addspace\&\space}

To get the 4 authors in this example to be truncated, you need to add uniquelist=false to the load options.

\documentclass[a4paper]{article}
\usepackage[dutch]{babel}               % Nederlands
\usepackage{filecontents}
\begin{filecontents*}{refs.bib}
@book{wood_2,
  title = {2 authors},
  author = {Wood, Linda and Kroger, Rolf},
  date = {2000},
  publisher = {{SAGE Publications}},
  location = {{California}},
  langid = {english}
}

@book{wood_3,
    title = {3 authors},
    author = {Wood, Linda and Kroger, Rolf and Subtle, Loosely},
    date = {2020},
    publisher = {{SAGE Publications}},
    location = {{California}},
    langid = {english}
}

@book{wood_4,
    title = {4 authors},
    author = {Wood, Linda and Kroger, Rolf and Subtle, Loosely and Else, Somebody},
    date = {2020},
    publisher = {{SAGE Publications}},
    location = {{California}},
    langid = {english}
}
\end{filecontents*}
\usepackage[innamebeforetitle=true,
            citestyle=ext-authoryear-comp,  % meerdere auteurs = chronologisch maar gegroepereerd per auteur
            bibstyle=ext-authoryear,
%           style=ext-authoryear-comp,      % meerdere auteurs = chronologisch maar gegroepereerd per auteur
            sortcites,                      % sorteer citaties per jaar,
            sorting=ynt,
            mincitenames=1,
            maxcitenames=3,
            maxbibnames=99,                 % Toon alle auteurs van een boek - https://tex.stackexchange.com/questions/1554/biblatex-displaying-all-authors-of-multi-author-works-in-the-bibliography
            uniquename=init,
            uniquelist=false,
            giveninits=true,                % initialen bij voornaam
            doi=false,                      % geen DOI
            isbn=false,                     % geen ISBN
            dashed=false,                   % auteurs moeten altijd voluit geschreven worden, hoe vaak ze ook geciteerd worden
            dateabbrev=false,
            backend=biber]{biblatex}
\addbibresource{refs.bib}

\DeclareDelimFormat[bib]{finalnamedelim}{\addspace\&\space}
\DeclareDelimFormat[]{finalnamedelim}{\ifnumgreater{\value{liststop}}{3}{\addspace\&\space}{\addspace\bibstring{and}\space}}%


\begin{document}

2 authors: \citeauthor{wood_2} - \autocite{wood_2}

3 authors: \citeauthor{wood_3} - \autocite{wood_3}

4 authors: \citeauthor{wood_4} - \citeauthor*{wood_4} - \autocite{wood_4}

    \newrefcontext[sorting=nyt]
    \printbibliography
\end{document}