This primary source comes from the Records of the War Department General and Special Staffs, 1860 - 1952.
Full Citation: Photograph 165-WW-6B-3; Airplanes - Flight - Lieut. Charles B. Austing, A.S., in remodeled De Haviland 4- plane which he is piloting from France Field, Canal Zone to Washington, D.C; 1917-1918; Airplanes - Flight; American Unofficial Collection of World War I Photographs, 1917 - 1918; Records of the War Department General and Special Staffs, 1860 - 1952, Record Group 165; National Archives at College Park, College Park, MDl. [Online Version, https://docsteach.org/documents/document/lieut-charles-b-austing-remodeled-de-haviland-4-plane, March 23, 2025]