APA

United States, . (1978). Airspace utilization considerations in the proposed construction alteration, activation & deactivation of airports. [Washington, D.C: .

Chicago

United States, . 1978. Airspace utilization considerations in the proposed construction alteration, activation & deactivation of airports. [Washington, D.C: .

Harvard

United States, . (1978). Airspace utilization considerations in the proposed construction alteration, activation & deactivation of airports. [Washington, D.C: .

MLA

United States, . Airspace utilization considerations in the proposed construction alteration, activation & deactivation of airports. [Washington, D.C: . 1978.