Não informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Chicago-referens (17:e uppl.)Não informado. AOPA Pilot. Bethesda, Md: Aircraft Owners and Pilots Association.
MLA-referens (8:e uppl.)Não informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.