It's impossible to mention all the books ever written about Porsche, so that's not my intention at all. I'll only tell you about the books I have in my personal library, and which I think are really worth owning. Ofcourse all tips regarding good books are always welcome.
Die ungewöhnliche Geschichte des Hauses Porsche, by Richard von Frankenberg
Race Porsche 356 911 550 Spyder 718 RSK Carrera Gmund Le Mans Mille Miglia Targa Florio Silverstone Circuit 904 906 908 910 917 912 Sebring endurance nurburgring solitude laguna seca brands hatch 24 H F1