United States. Civil Aeronautics Board. Bureau of Operating Rights. Standards Division. Trunkline carrier domestic passenger enplanements. Civil Aeronautics Board.
Chicago Style (17th ed.) CitationUnited States. Civil Aeronautics Board. Bureau of Operating Rights. Standards Division. Trunkline Carrier Domestic Passenger Enplanements. Washington: Civil Aeronautics Board.
MLA (9th ed.) CitationUnited States. Civil Aeronautics Board. Bureau of Operating Rights. Standards Division. Trunkline Carrier Domestic Passenger Enplanements. Civil Aeronautics Board.
Warning: These citations may not always be 100% accurate.