I am using Texmaker for my paper and I encounter a problem here and hope somebody can help me.
As you can see here, the titles are some in Italics and some are not. What cause this anyway? I don't use cite btw, only footnote.
\begin{thebibliography}{99}
\bibitem[Monopolkommision (1988)]{monopol1988} Monopolkommision (1988): \em{Siebentes Hauptgutachten der Monopolkommission 1986/1987}, In: Deutscher Bundestag Online, 19.07.1988 (http://dipbt.bundestag.de/doc/btd/11/026/1102677.pdf vom 16.08.2016).
\bibitem[Monopolkommision (1992)]{monopol1992} Monopolkommision (1992): \em{Neuntes Hauptgutachten der Monopolkommission 1990/1991} (http://dipbt.bundestag.de/doc/btd/12/030/1203031.pdf vom 16.08.2016).
\bibitem[Monopolkommision (2016)]{monopol2016} Monopolkommision (2016): \em{Wettbewerb 2016: Einundzwanzigstes Hauptgutachten der Monopolkommission gemäß § 44 Abs. 1 Satz 1 GWB} (http://www.monopolkommission.de/index.php/de/gutachten/hauptgutachten/liste-hauptgutachten vom 21.09.2016).
\end{thebibliography}
what is wrong here? these are the packages i used.
\documentclass[oneside,12pt,german , a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[backend=biber,style=authoryear]{biblatex}
\usepackage{geometry}
\usepackage[graphicx]{realboxes}
\usepackage{lmodern}
\usepackage{setspace}
\usepackage{caption}
\usepackage{eurosym}
\usepackage{import}
\usepackage{float}
\usepackage{biblatex}
\usepackage{pdflscape}
\usepackage{multirow}
\usepackage{pbox}
\usepackage{filecontents}
%\usepackage{acro}
\usepackage[printonlyused]{acronym}
\usepackage[bottom]{footmisc}
\geometry{
a4paper,
total={210mm,297mm},
left=45mm,
right=15mm,
top=25mm,
bottom=15mm,
}
\graphicspath{ {images/} }
\onehalfspacing
\captionsetup{justification=raggedright,singlelinecheck=false}
\nocite{*}
I did have some renewcommand, but I think this is not the cause.
\makeatletter
%\renewcommand{\bibname}{Literaturen}
\renewcommand{\contentsname}{Inhalt}
%\renewcommand{\acronymname}{Abkürzungsverzeichnis}
\renewcommand{\figurename}{\textbf{Abbildung}}
\renewcommand\listfigurename{Abbildungsverzeichnis}
\renewcommand\listtablename{Tabellenverzeichnis}
\renewcommand\@biblabel[1]{}
\renewcommand\footnotesize{%
\@setfontsize\footnotesize\@ixpt{10}%
\abovedisplayskip 8\p@ \@plus2\p@ \@minus4\p@
\abovedisplayshortskip \z@ \@plus\p@
\belowdisplayshortskip 4\p@ \@plus2\p@ \@minus2\p@
\def\@listi{\leftmargin\leftmargini
\topsep 4\p@ \@plus2\p@ \@minus2\p@
\parsep 2\p@ \@plus\p@ \@minus\p@
\itemsep \parsep}%
\belowdisplayskip \abovedisplayskip
}
\makeatother
I think I post in the wrong website since nobody answer me on Stackoverflow. Anyway thank you for the help.

\emis a switch, i.e. it does not take any arguments, so after\em{...}the font is still\em. Use\emphinstead – daleif Sep 26 '16 at 13:51{\em emphasized text}or this way:\emph{emphasized text}. – gernot Sep 26 '16 at 13:52\begin{document}, it is used to configure your document – daleif Sep 26 '16 at 14:32biblatex(twice!) if you then use the manualthebibliography? Check http://golatex.de/wichtige-hinweise-erstellung-von-literaturverzeichnissen-t11964.html as well as http://biblatex.dominik-wassenhoven.de/download/DTK-2_2008-biblatex-Teil1.pdf for help on how to really usebiblatex; also http://www.komascript.de/latexvorlage. See also biblatex in a nutshell (for beginners). – moewe Sep 26 '16 at 15:25