The SAS at War: 1941-1945 by Anthony Kemp
This book traces the history of Stirling's creation from its birth to its untimely death and then rebirth as a territorial army unit in 1947. Using documentation as well as 100 operational files which give minute details of the regiment's sucesses - and blunders - during the years, this book also includes interviews with key members of the SAS from the period.