Gilbert, J. (1975). The world's worst aircraft. M & J Hobbs in association with Michael Joseph.
Dyfyniad Arddull ChicagoGilbert, James. The World's Worst Aircraft. Walton-on-Thames [Eng.]: M & J Hobbs in association with Michael Joseph, 1975.
Dyfyniad MLAGilbert, James. The World's Worst Aircraft. M & J Hobbs in association with Michael Joseph, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.