APA (7th ed.) Citation

United States. Civil Aeronautics Administration. (1941). Digest of civil air regulations for pilots (4th ed., Jan. 1941.). U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

United States. Civil Aeronautics Administration. Digest of Civil Air Regulations for Pilots. 4th ed., Jan. 1941. Washington: U.S. Govt. Print. Off, 1941.

MLA (9th ed.) Citation

United States. Civil Aeronautics Administration. Digest of Civil Air Regulations for Pilots. 4th ed., Jan. 1941. U.S. Govt. Print. Off, 1941.