APA

United States, . (1977). Acceptable methods, techniques, & practices air alterations. [Washington, D.C: .

Chicago

United States, . 1977. Acceptable methods, techniques, & practices air alterations. [Washington, D.C: .

Harvard

United States, . (1977). Acceptable methods, techniques, & practices air alterations. [Washington, D.C: .

MLA

United States, . Acceptable methods, techniques, & practices air alterations. [Washington, D.C: . 1977.