%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Heidrichsen.1924} Heidrich(sen.). (1924). \textit{Die Fischereiverh{\"a}ltnisse in der Unterweser} (Vol. 4).

\end{thebibliography}

\end{document}

