United States. Civil Aeronautics Board. Office of Facilities and Operations. (1970). Certificated Alaska air routes, December 31, 1970. Civil Aeronautics Board.
Chicago Style (17th ed.) CitationUnited States. Civil Aeronautics Board. Office of Facilities and Operations. Certificated Alaska Air Routes, December 31, 1970. [Washington, D.C.]: Civil Aeronautics Board, 1970.
MLA (8th ed.) CitationUnited States. Civil Aeronautics Board. Office of Facilities and Operations. Certificated Alaska Air Routes, December 31, 1970. Civil Aeronautics Board, 1970.
Warning: These citations may not always be 100% accurate.