APA

United States, . (19). Definition of "U.S. national aviation standards. [Washington, D.C: .

Chicago

United States, . 19. Definition of "U.S. national aviation standards. [Washington, D.C: .

Harvard

United States, . (19). Definition of "U.S. national aviation standards. [Washington, D.C: .

MLA

United States, . Definition of "U.S. national aviation standards. [Washington, D.C: . 19.