Não informado. (1930). Engineering and mining world. McGraw-Hill Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Engineering and Mining World. New York: McGraw-Hill Publications, 1930.
Lua MLA (8ú heag.)Não informado. Engineering and Mining World. McGraw-Hill Publications, 1930.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.