Operators manual :
helicopter, observation OH-6A.
APA Citation
United States. Department of the Army. (1990). Operators manual: helicopter, observation OH-6A. [Washington, DC]: Headquarters, Dept. of the Army.
MLA Citation
United States. Department of the Army. Operators Manual: Helicopter, Observation OH-6A. [Washington, DC]: Headquarters, Dept. of the Army, 1990.
Warning: These citations may not always be complete (especially for serials).