APA

United States, . (1973). Air traffic (AT) system error reporting program. [Washington, D.C: .

Chicago

United States, . 1973. Air traffic (AT) system error reporting program. [Washington, D.C: .

Harvard

United States, . (1973). Air traffic (AT) system error reporting program. [Washington, D.C: .

MLA

United States, . Air traffic (AT) system error reporting program. [Washington, D.C: . 1973.