APA (7th ed.) Citation

United States. Civil Aeronautics Board. Office of the Secretary. (1968). United States air transportation system; routes certificated to local service carriers: December 31, 1968.

Chicago Style (17th ed.) Citation

United States. Civil Aeronautics Board. Office of the Secretary. United States Air Transportation System; Routes Certificated to Local Service Carriers: December 31, 1968. [Washington, 1968.

MLA (8th ed.) Citation

United States. Civil Aeronautics Board. Office of the Secretary. United States Air Transportation System; Routes Certificated to Local Service Carriers: December 31, 1968. 1968.

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