Project 928: A Development History of the Porsche 928 from First Sketch to Production: Julius Joseph Weitmann, Rico Steinemann: 9783879435180: Amazon.com: Books
Porsche 928: Daten, Fakten, Preise des Youngtimers - FOCUS online
Amazon | Porsche 928: 1977-1996 (The Essential Buyer's Guide) | Hemmings, David | Transportation
Porsche 928 : Hemmings, David: Amazon.de: Bücher
Opel Diplomat/Porsche 928: Classic Cars | autozeitung.de