ISBN 0-89201-092-4.#*USAAS-USAAC-USAAF-USAF Aircraft Serial Numbers—1908 to present*The Bishop's Stortford Herald newspaper, 26 April 2007.
* [http://home.att.net/~jbaugher/usafserials.html] USAAS-USAAC-USAAF-USAF Aircraft Serial Numbers—1908 to present* The Bishop’s Stortford Herald newspaper, 26 April 2007.