LaTeX Forum

 \documentclass[a4paper,12pt,smallheadings]{scrreprt}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[ngerman]{babel}
\usepackage[left=4cm,top=3cm,right=2cm,bottom=2cm]{geometry}
\usepackage{csquotes}
                
\usepackage[backend=biber,style=authoryear,isbn=false]{biblatex}
\bibliography{bibliography}

%in Fusszitaten Jahre in Klammern
\renewbibmacro*{cite:labelyear+extrayear}{%
\iffieldundef{labelyear}
{}
{\printtext[bibhyperref]{%
\mkbibparens{%
\printfield{labelyear}%
\printfield{extrayear}}}}}
%
% Titel im Literaturverzeichnis nicht mehr kursiv
\DeclareFieldFormat{title}{#1\isdot}





\begin{document}

 \include{chapter01}

\printbibliography

\end{document}

@book{Statista,
  title={Wertorientiertes Start-Up-Management: Grundlagen, Konzepte, Strategien},
  author={Hommel, U.},
  isbn={9783800627363},
  year={2002},
  address     =   {Bonn},
  publisher={Vahlen},
  
}