APA

United States, . (1985). Obstruction marking and lighting. [Washington, D.C: .

Chicago

United States, . 1985. Obstruction marking and lighting. [Washington, D.C: .

Harvard

United States, . (1985). Obstruction marking and lighting. [Washington, D.C: .

MLA

United States, . Obstruction marking and lighting. [Washington, D.C: . 1985.