Não informado. (1929). Machine Design: As it affects engineering, production, sales. Penton Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Machine Design: As It Affects Engineering, Production, Sales. Cleveland, Ohio: Penton Publishing, 1929.
Lua MLA (8ú heag.)Não informado. Machine Design: As It Affects Engineering, Production, Sales. Penton Publishing, 1929.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.