APA

United States, . (1986). Instruction book digital altimeter setting indicator. [Washington, D.C: .

Chicago

United States, . 1986. Instruction book digital altimeter setting indicator. [Washington, D.C: .

Harvard

United States, . (1986). Instruction book digital altimeter setting indicator. [Washington, D.C: .

MLA

United States, . Instruction book digital altimeter setting indicator. [Washington, D.C: . 1986.