United States. Army. Air Corps. (1932). Handbook of instructions with parts catalog for YO-31A observation airplane, manufactured by Douglas Aircraft Company, Incorporated. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Army. Air Corps. Handbook of Instructions with Parts Catalog for YO-31A Observation Airplane, Manufactured by Douglas Aircraft Company, Incorporated. [United States]: [publisher not identified], 1932.
MLA (9th ed.) CitationUnited States. Army. Air Corps. Handbook of Instructions with Parts Catalog for YO-31A Observation Airplane, Manufactured by Douglas Aircraft Company, Incorporated. [publisher not identified], 1932.
Warning: These citations may not always be 100% accurate.