Special character in \url

Go to wikipedia and copy its URL as such; then add \ before each %:

\documentclass{article}
\usepackage{hyperref}
\begin{document}
\url{http://www.wikiwand.com/pl/Prawo_Lewisa-Mogridge\%E2\%80\%99a}
\end{document}

EDIT 1

Instead of \url, you can use \href, in case you want the hyperlink:

\documentclass{report}
\usepackage{hyperref}
\begin{document}
    \href{http://www.wikiwand.com/pl/Prawo_Lewisa-Mogridge\%E2\%80\%99a}
    {http://wikiwand.com/pl/Prawo\_Lewisa-Mogridge\textquoteright{}a}
\end{document}

EDIT 2

On the other hand, according to Wikipedia, this is the right way to cite:

//pl.wikipedia.org/w/index.php?title=Prawo_Lewisa-Mogridge%E2%80%99a&oldid=39769503

Check the link