%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Ruta2003} Ruta M., \textit{Kalmana Segala dwuj{\k e}zyczno{\'s}{\'c} literacka}, [w:]  \textit{Anabasis: Prace ofiarowane Pani Profesor Krystynie Pisarkowej}, red.~Bobrowski, I., Krak{\'o}w, 2003, s. 273--8

\end{thebibliography}

\end{document}

