APA

United States, . (1975). Certification: pilot schools. [Washington, D.C: .

Chicago

United States, . 1975. Certification: pilot schools. [Washington, D.C: .

Harvard

United States, . (1975). Certification: pilot schools. [Washington, D.C: .

MLA

United States, . Certification: pilot schools. [Washington, D.C: . 1975.