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Toward Aviation 1919–1941. Department of the Air Force. p. 19. ISBN 978-0-16-061379-1. Frandsen, Bert (2014). "Learning and Adapting: Billy Mitchell in...25 KB (2,646 words) - 15:28, 27 August 2024
1919–1941. Maxwell Air Force Base, AL: Air University Press. ISBN 978-0-16-061379-1. Watson, Mark Skinner (1991). Chief of Staff: Pre-war Plans and Preparations...149 KB (18,166 words) - 17:23, 7 November 2024
1919–1941. Maxwell Air Force Base, Alabama: Air University. ISBN 978-0-16-061379-1. OCLC 39380518. Retrieved 25 June 2011. Tonnell, Brian W. (2002)....53 KB (6,483 words) - 14:23, 17 October 2024
