APA

United States, . (1977). U.S. national aviation standard for the VHF air-ground communications system. [Washington, D.C: .

Chicago

United States, . 1977. U.S. national aviation standard for the VHF air-ground communications system. [Washington, D.C: .

Harvard

United States, . (1977). U.S. national aviation standard for the VHF air-ground communications system. [Washington, D.C: .

MLA

United States, . U.S. national aviation standard for the VHF air-ground communications system. [Washington, D.C: . 1977.