Pfeifer was a member of the German Bundestag from 1969 to 2002. He always entered the Bundestag as a directly elected member of the Reutlingen constituency.
Literature
Herbst, Ludolf; Jahn, Bruno (2002). Vierhaus, Rudolf (ed.). Biographisches Handbuch der Mitglieder des Deutschen Bundestages. 1949–2002 [Biographical Handbook of the Members of the German Bundestag. 1949–2002] (in German). München: De Gruyter - De Gruyter Saur. p. 1715. ISBN978-3-11-184511-1.
Speaker: Marieluise Beck-Oberdorf, Petra Kelly, Otto Schily until 3 April 1984; Annemarie Borgmann, Waltraud Schoppe, Antje Vollmer until 30./31. January 1985;
Sabine Bard, Hannegret Hönes, Christian Schmidt until 1 February 1986; Annemarie Borgmann, Hannegret Hönes, Ludger Volmer until 18 July 1986); Willi Hoss (8 September 1986)