Não informado. (1933). Bibliography and Index of Geology Exclusive of North America. Geological Society of America.
Lua i Stíl Chicago (17ú heag.)Não informado. Bibliography and Index of Geology Exclusive of North America. Washington: Geological Society of America, 1933.
Lua MLA (8ú heag.)Não informado. Bibliography and Index of Geology Exclusive of North America. Geological Society of America, 1933.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.