%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Gasiorowski2002} G{\k a}siorowski S., \textit{Spira Natan Nata ben Salomon (1585-1633)}, [w:]  \textit{Polski S{\l}ownik Biograficzny}, t. 41, nr 1(168), Krak{\'o}w, 2002, s. 115--6

\end{thebibliography}

\end{document}

