Não informado. (1959). Material Handling Engineering. Penton Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Material Handling Engineering. Cleveland, Ohio: Penton Publishing, 1959.
Lua MLA (8ú heag.)Não informado. Material Handling Engineering. Penton Publishing, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.