2d Lieutenant Errol Henry Zistel, AEF, 1918.
United States Army Air Service
1918
Gross, Charles J (1996), The Air National Guard and the American Military Tradition, United States Dept. of Defense, <a href="//commons.wikimedia.org/wiki/Special:BookSources/0160483026" title="Special:BookSources/0160483026">ISBN 0160483026</a>