APA

United States, . (1977). Prevention of retractable landing gear failures. [Washington, D.C: .

Chicago

United States, . 1977. Prevention of retractable landing gear failures. [Washington, D.C: .

Harvard

United States, . (1977). Prevention of retractable landing gear failures. [Washington, D.C: .

MLA

United States, . Prevention of retractable landing gear failures. [Washington, D.C: . 1977.