APA

United States, . (1985). AC:27-1 certification of normal category rotorcraft. [Washington, D.C: .

Chicago

United States, . 1985. AC:27-1 certification of normal category rotorcraft. [Washington, D.C: .

Harvard

United States, . (1985). AC:27-1 certification of normal category rotorcraft. [Washington, D.C: .

MLA

United States, . AC:27-1 certification of normal category rotorcraft. [Washington, D.C: . 1985.