%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Hoepflinger2020} H{\"o}pflinger, A. - K. (2020). \textit{Religi{\"o}se Codes in der Popul{\"a}rkultur: Kleidung der Black Metal-Szene}. Baden-Baden: Nomos.

\end{thebibliography}

\end{document}

