Tham khảo Percival Petrel

Ghi chú
  1. ↑ Mondey, David. The Hamlyn Concise Guide to British Aircraft of World War II. London: Chancellor Press, 1994. ISBN 1-85152-668-4.
Tài liệu
  • Ellis, Ken. Wrecks & Relics. Hinckley, UK: Midland Publishing, 2006. ISBN 1-85780-235-7.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). London: Orbis Publishing, 1985.
  • Jackson, A.J. British Civil Aircraft Since 1919, Volume 3. London: Putnam, 1974. ISBN 0-7001-0014-X .