Harding, R. M., & Mills, F. J. (1983). Is the crew fit to fly? I: Licensing requirements for aircrew.
Παραπομπή Chicago StyleHarding, R M., και F J. Mills. Is the Crew Fit to Fly? I: Licensing Requirements for Aircrew. 1983.
Παραπομπή MLAHarding, R M., και F J. Mills. Is the Crew Fit to Fly? I: Licensing Requirements for Aircrew. 1983.
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