Airline transport pilot (helicopter) written examination guide.
APA Citation
United States. Flight Standards Service. (1962). Airline transport pilot (helicopter) written examination guide. Washington: U.S. Govt. Print. Off..
MLA Citation
United States. Flight Standards Service. Airline Transport Pilot (helicopter) Written Examination Guide. Washington: U.S. Govt. Print. Off., 1962.
Warning: These citations may not always be complete (especially for serials).