%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Gasiorowski2008} G{\k a}siorowski S., \textit{Karaimi w Koronie i na Litwie w XV-XVIII wieku}, Krak{\'o}w-Budapeszt, 2008, 598 ss.

\end{thebibliography}

\end{document}

