My four favorite books on the GT 40. In no particular order of favorite are "GT 40, an individual history and race record." By Ronnie Spain. This is an intensive record of every single GT40 built. It's fascinating! The second one, "Inside Shelby American, racing and wrenching with Carroll Shelby in the 1960's." This one is a really good first hand account of the work day situation at SAI in the mid 60's. By John Morton,It's awesome, too! The third one is an archive work titled "Shelby GT40, original archives 1964 to 1967". By Dave Friedman. Shelby team official photographer. And the last favorite book is "Kar Kraft, race cars, prototypes and muscle cars of Ford's specialty vehicle activity program." I included this one because Kar Kraft became involved in building GT40 chassis and race prep as the program accelerated toward it's Finnish. Other groups, like Holman and Moody were also building their variations on the GT40 race chassis. But, the guy's who first dealt with the disaster of a program that Ford advanced vehicles (FAV) had made of the first iteration of the Ford GT was the wizard's at Shelby American. A thick book could be written about the genesis of the GT40 up to the point that the busted, effd up messes were dumped at Shelby's door. Needless to say, I have been interested in the the entire process of what it took to do what they did for quite some time.