Operator's manual :
Army model OH-58C helicopter.

APA Citation

United States. Department of the Army. (1989). Operator's manual: Army model OH-58C helicopter. [Washington, D.C.]: Headquarters, Dept. of the Army.

MLA Citation

United States. Department of the Army. Operator's Manual: Army Model OH-58C Helicopter. [Washington, D.C.]: Headquarters, Dept. of the Army, 1989.

Warning: These citations may not always be complete (especially for serials).