APA

United States, . (1984). Certification: pilots and flight instructors. [Washington, D.C: .

Chicago

United States, . 1984. Certification: pilots and flight instructors. [Washington, D.C: .

Harvard

United States, . (1984). Certification: pilots and flight instructors. [Washington, D.C: .

MLA

United States, . Certification: pilots and flight instructors. [Washington, D.C: . 1984.