Não informado. (1950). Power Engineering. Pennwell Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Power Engineering. Barrington, Ill: Pennwell Publishing, 1950.
Lua MLA (8ú heag.)Não informado. Power Engineering. Pennwell Publishing, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.