LaTeX Forum

\documentclass[fontsize=12pt,a4paper,bibliography=totoc,parskip=half]{scrartcl} 
\usepackage[ngerman]{babel}
 
\usepackage[T1]{fontenc} 
\usepackage[utf8]{inputenc} 

\usepackage{mathtools} %coloneqq
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{mathrsfs} %mathscr

\usepackage{stmaryrd} %Widerspruchsblitz
\usepackage{float} %figure[H]

\usepackage{graphicx}
\usepackage{subfig} %subfloat

\usepackage{geometry} %Seitenränder
\usepackage{setspace}

\geometry{a4paper, top=20mm, left=30mm, right=30mm, bottom=25mm, headsep=5mm, footskip=12mm}

\usepackage[style=authoryear,backend=biber]{biblatex} 
\addbibresource{Lit.bib}

\begin{document}

\section{Einleitung}
\cite{viro}
\printbibliography
\end{document} 

\begin{filecontents*}{Lit.bib}
% Encoding: UTF-8
@Article{viro,
  author  = {Viro, O.},
  title   = {WHAT IS ...An Amoeba?},
  year    = {2002},
  volume  = {49},
  number  = {8},
  month   = {September},
  pages   = {916-917},
  journal = {Notices of the AMS},
}

@Comment{jabref-meta: databaseType:biblatex;}
\end{filecontents*}
\documentclass[fontsize=12pt,a4paper,DIV=9,bibliography=totoc,parskip=half]{scrartcl} 
\usepackage[ngerman]{babel}

\usepackage[T1]{fontenc} 
\usepackage[utf8]{inputenc} 

\usepackage[style=authoryear,backend=biber]{biblatex} 
\addbibresource{Lit.bib}

\begin{document}

\section{Einleitung}
\cite{viro}
\printbibliography
\end{document}

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\begin{filecontents*}{Lit.bib}
% Encoding: UTF-8
@Article{viro,
  author  = {Viro, O.},
  title   = {WHAT IS ...An Amoeba?},
  year    = {2002},
  volume  = {49},
  number  = {8},
  month   = {September},
  pages   = {916-917},
  journal = {Notices of the AMS},
}

@Comment{jabref-meta: databaseType:biblatex;}
\end{filecontents*}
\documentclass[fontsize=12pt,a4paper,DIV=9,bibliography=totoc,parskip=half]{scrartcl} 
\usepackage[ngerman]{babel}

\usepackage[T1]{fontenc} 
\usepackage[utf8]{inputenc} 

\usepackage[style=alphabetic,backend=biber]{biblatex} 
\addbibresource{Lit.bib}

\setlength{\bibhang}{2em}

\begin{document}

\section{Einleitung}
\cite{viro}
\printbibliography
\end{document}

\begin{filecontents*}{Lit.bib}
% Encoding: UTF-8
@Article{viro,
  author  = {Viro, O.},
  title   = {WHAT IS ...An Amoeba?},
  year    = {2002},
  volume  = {49},
  number  = {8},
  month   = {September},
  pages   = {916-917},
  journal = {Notices of the AMS},
}

@Comment{jabref-meta: databaseType:biblatex;}
\end{filecontents*}
\documentclass[fontsize=12pt,a4paper,DIV=9,bibliography=totoc,parskip=half]{scrartcl} 
\usepackage[ngerman]{babel}

\usepackage[T1]{fontenc} 
\usepackage[utf8]{inputenc} 

\usepackage[style=alphabetic,backend=biber]{biblatex} 
\addbibresource{Lit.bib}

% -- Gehört eigentlich in eine passende bbx-Datei: -->
% Im Unterschied zu alphabetic den Eintrag ab der zweiten
% Zeile zusätzlich zum Label-Einzug um \bibindent einziehen.
\defbibenvironment{bibliography}
  {\list
     {\printtext[labelalphawidth]{%
        \printfield{labelprefix}%
        \printfield{labelalpha}%
        \printfield{extraalpha}}}
     {\setlength{\labelwidth}{\labelalphawidth}%
      \setlength{\leftmargin}{\labelwidth}%
      \setlength{\labelsep}{\biblabelsep}%
      \addtolength{\leftmargin}{\labelsep}%
      \addtolength{\leftmargin}{\bibhang}% Eingefügt!
      \setlength{\itemindent}{-\bibhang}% Eingefügt!
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}%
      \renewcommand*{\makelabel}[1]{##1\hss}%
      }}
  {\endlist}
  {\item}
% <---

\setlength{\bibhang}{2em}

\begin{document}

\section{Einleitung}
\cite{viro}
\printbibliography
\end{document}