%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Panning1938} Panning, A. (1938). \textit{Der amerikanische Flu{\ss}krebs (Cambarus affinis SAY) in Hamburger Gew{\"a}ssern} (Vol. 6 N. F.).

\end{thebibliography}

\end{document}

