The change of motives to become and to be a party member : an empirical analysis of the German party membership studies 1998, 2009 and 2017 - Lüdecke, Yvonne; Klein, Markus 1969-; Springer, Frederik; Bernhold, Philipp; Czeczinski, Lisa; Schmidt, Bastian (Kölner Zeitschrift für Soziologie und Sozialpsychologie, 2022)