Yeomans, T., & Mittelbach, F. G. (1975). The helicopter air service passenger program: A retrospect. California, LA: University of California.
Παραπομπή Chicago StyleYeomans, Tim, and Frank G. Mittelbach. The Helicopter Air Service Passenger Program: A Retrospect. California, LA: University of California, 1975.
Παραπομπή MLAYeomans, Tim, and Frank G. Mittelbach. The Helicopter Air Service Passenger Program: A Retrospect. California, LA: University of California, 1975.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.