Não informado. (1956). Journal of the American Helicopter Society. American Helicopter Society.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of the American Helicopter Society. Washington: American Helicopter Society, 1956.
Lua MLA (8ú heag.)Não informado. Journal of the American Helicopter Society. American Helicopter Society, 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.