APA

United States, . (1980). Private and commercial pilot glider written test guide. [Washington, D.C: .

Chicago

United States, . 1980. Private and commercial pilot glider written test guide. [Washington, D.C: .

Harvard

United States, . (1980). Private and commercial pilot glider written test guide. [Washington, D.C: .

MLA

United States, . Private and commercial pilot glider written test guide. [Washington, D.C: . 1980.