@incollection{Haeusler2013, author = {H{\"a}usler, Alexander}, title = {B{\"u}rgerbewegung Pro Nordrhein-Westfalen (pro NRW)}, booktitle = {Handbuch der deutschen Parteien}, edition = {2. Aufl.}, editor = {Frank Decker and Viola Neu}, isbn = {978-3-658-00963-2}, year = {2013}, }