APA

United States, . (1971). Guidelines for airport spacing & traffic pattern airspace areas. [Washington, D.C: .

Chicago

United States, . 1971. Guidelines for airport spacing & traffic pattern airspace areas. [Washington, D.C: .

Harvard

United States, . (1971). Guidelines for airport spacing & traffic pattern airspace areas. [Washington, D.C: .

MLA

United States, . Guidelines for airport spacing & traffic pattern airspace areas. [Washington, D.C: . 1971.