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@book{aristotle:physics,
  author       = {Aristotle},
  title        = {Physics},
  date         = 1929,
  translator   = {Wicksteed, P. H. and Cornford, F. M.},
  publisher    = {G. P. Putnam},
  shorttitle   = {Physics},
}

@book{wilde,
  author       = {Wilde, Oscar},
  title        = {The Importance of Being Earnest: A Trivial
Comedy for Serious People},
  year         = 1899,
  series       = {English and American drama of the Nineteenth
Century},
  publisher    = {Leonard Smithers and Company},
}
 

\documentclass{article}
\usepackage[german,english]{babel}
\usepackage[style=authoryear]{biblatex}
\addbibresource{biblatex-examples.bib}
\begin{document}
text
\parencite{aristotle:physics}
\cite{wilde}
\printbibliography
\end{document}

\documentclass{article}
\usepackage[german,english]{babel}
\usepackage{biblatex}
\addbibresource{MeineLiteratur.bib}
\begin{document}
text
\parencite{aristotle:physics}
\cite{wilde}
\printbibliography
\end{document}
 

%
\documentclass[12pt,a4paper]{article} 
\usepackage[german,english]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage{latexsym} 
\usepackage{amsfonts} 
\usepackage{amssymb} 
\usepackage{amsmath}
\usepackage[onehalfspacing]{setspace}
\usepackage[a4paper,left=4cm,right=2cm,top=2cm,bottom=2cm,includeheadfoot]{geometry} 
\pagestyle{plain}
\topmargin -1cm 
\textheight 25cm 
\textwidth 16.0 cm 
\oddsidemargin 0.2cm 
\begin{document}
\selectlanguage{english}
\begin{titlepage}
Titelblatt
\end{titlepage}
\pagenumbering{roman}
.....
\tableofcontent
\pagenumbering{arabic}
.....
....
.....
\pagenumbering{roman}
\setcounter{page}{3}   %setzt die Anzahl der röm. Ziffern auf 3 hoch, muss evtl angepasst werden
\bibliographystyle{alphadin}
\makeatletter
\renewcommand*\@biblabel[1]{}
\makeatother
\setlength{\labelsep}{5pt}

%hier beginnt das Literaturverzeichnis

\begin{thebibliography}{99}
Ahn, Dong-Hyun; Bondoukh, Jacob; Richardson, Matthew; Whitelaw, Robert F. (1999): Optimal Risk Management Using Options, The Journal of Finance, Vol. 54, No. 1, pp. 359-375 \\
Bartram, Söhnke M.; Brown, Gregory W.; Fehle, Frank R. (2009): International Evidence on Financial Derivatives Usage, Financial Management, Vol. 38, No. 1, pp. 185-206 \\
.....
\end{thebibliography}
\end{document}
%