APA

United States, . (1983). Change 6 to utility airports--air access to national transportation--airport type and airport hazard clarification. [Washington, D.C: .

Chicago

United States, . 1983. Change 6 to utility airports--air access to national transportation--airport type and airport hazard clarification. [Washington, D.C: .

Harvard

United States, . (1983). Change 6 to utility airports--air access to national transportation--airport type and airport hazard clarification. [Washington, D.C: .

MLA

United States, . Change 6 to utility airports--air access to national transportation--airport type and airport hazard clarification. [Washington, D.C: . 1983.