Amazon | Porsche 981 Boxster & Cayman: Model years 2012 to 2016 Boxster, S, GTS & Spyder; Cayman, S, GTS, GT4 & GT4 CS (Essential Buyer's Guide) | Streather, Adrian | Consumer Guides
Porsche 987 Boxster & Cayman: 2nd Generation - Model years 2009 to 2012 Boxster, S, Spyder & Black Editions; Cayman, S, R & Black Editions by Adrian Streather | Goodreads