Porsche 911 Carrera Service Manual: 1984, 1985, 1986, 1987, 1988, 1989: Bentley Publishers: 9780837616964: Books - Amazon
Das Porsche 911er Motoren Schrauberhandbuch - Reparieren und Optimieren leicht gemacht: Alle Porsche 911 Motoren 1965-1989: Dempsey, Wayne R.: 9783868529463: Amazon.com: Books
Porsche 911: Carrera 3.2 (1983-1989) (The Ultimate Owner's Guide): Wingrove, Gordon: 9781906712020: Books: Amazon.com
Porsche 911 Codes: Vehicle identification, paint, options and materials. Model years 1989 to 2012, Streather, Adrian, eBook - Amazon.com