APA

United States, . (1982). Air taxi operators and commercial operators. [Washington, D.C: .

Chicago

United States, . 1982. Air taxi operators and commercial operators. [Washington, D.C: .

Harvard

United States, . (1982). Air taxi operators and commercial operators. [Washington, D.C: .

MLA

United States, . Air taxi operators and commercial operators. [Washington, D.C: . 1982.