Porsche 911 Enthusiast's Companion: Carrera 2, Carrera 4, and Turbo 1989-1994 by Streather, Adrian published by Bentley (Robert) Inc.,US (2004): Amazon.com: Books
Porsche 911: Carrera 3.2 (1983-1989) (The Ultimate Owner's Guide): Wingrove, Gordon: 9781906712020: Books: Amazon.com
Porsche 911: 1974-1989: Storz, Alexander F.: 9783613039957: Amazon.com: Books
Porsche 911 The classic models (1964-1989): The Classic Models (1964-1989) Including Turbo and 912 (Ultimate Buyers' Guide): Morgan, Peter: 9780954999094: Amazon.com: Books
Praxisratgeber Klassikerkauf Porsche 911: Alle Modelle bis 1989 (German Edition), Morgan, Peter, eBook - Amazon.com
Porsche 911 Carrera Service Manual: 1984, 1985, 1986, 1987, 1988, 1989: Bentley Publishers: 9780837616964: Books - Amazon