|AviationHeritage.org - Working to document aviation heritage and history through the use of modern technologies|
|Curtiss P-40F, Lockheed Hudson, and CAC Boomerang (Daniel J. Leahy, 2014)|
PINGREE, RICHARD EARL
Dunn, P. 2017 Crash of a P-40E Kittyhawk at Port Pirie, SA. Australia @ War. Retrieved 29 December 2017 from <https://www.ozatwar.com/ozcrashes/sa06.htm>.
U.S. Department of Veterans Affairs 2014 Nationwide Gravesite Locator. Retrieved 29 December 2017 from <https://gravelocator.cem.va.gov/>.
Record updated on 29 December 2017.