Não informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Chicago (17e ed.) BronvermeldingNão informado. AOPA Pilot. Bethesda, Md: Aircraft Owners and Pilots Association.
MLA (8e ed.) BronvermeldingNão informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Let op: Deze citaties zijn niet altijd 100% accuraat.