Please list your must-haves.

Racing

• Automobile Year

(Auto)Biographical

• Life at the Limit: Triumph and Tragedy in Formula One. Watkins, Sid (1996)
• The Life of Senna, Rubython, Tom (2004) ISBN 0954685733

Marque-specific

• BMW The Complete Story from 1928, Werner Oswald & Jeremy Walton, Foulis/Haynes, ISBN 0854293159

Periodical

The Cars of BMC , Graham Robson, Motorbooks International,(ISBN 10: 1899870415 / ISBN 13: 9781899870417 ) A good read for BMC cars. (http://www.abebooks.co.uk/Cars-Bmc-Graham-Robson-Motorbooks-International/1228477443/bd)

A-Z British Sports and Thoroughbred Motor Cars 1919-1939 , Nick Walker, Herridge & Sons Limited, ISBN-10: 1906133018
ISBN-13: 978-1906133016, seems excellent (http://books.google.co.uk/books/about/A_Z_British_Sports_Thoroughbred_Motor_Ca.html?id=F0SBGQAACAAJ)

Technical/Reference

• The New Encyclopedia of Automobiles, GN Georgano (ed), George Rainbird Ltd, ISBN 0-517-60569-4

Repair