Não informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Chicago-viite (17. p.)Não informado. AOPA Pilot. Bethesda, Md: Aircraft Owners and Pilots Association.
MLA-viite (8. p.)Não informado. AOPA Pilot. Aircraft Owners and Pilots Association.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.