APA (7th ed.) Citation

United States. Civil Aeronautics Authority. (1939). Directory of airports and seaplane bases. U.S. Govt. Print. Off..

Chicago Style (17th ed.) Citation

United States. Civil Aeronautics Authority. Directory of Airports and Seaplane Bases. Washington: U.S. Govt. Print. Off., 1939.

MLA (8th ed.) Citation

United States. Civil Aeronautics Authority. Directory of Airports and Seaplane Bases. U.S. Govt. Print. Off., 1939.

Warning: These citations may not always be 100% accurate.