Cowen, R., & Lipps, J. H. (1975). Controversies in the earth sciences: A reader. West Pub. Co.
Lua i Stíl Chicago (17ú heag.)Cowen, Richard, agus Jere H. Lipps. Controversies in the Earth Sciences: A Reader. St. Paul, Missouri: West Pub. Co, 1975.
Lua MLA (9ú heag.)Cowen, Richard, agus Jere H. Lipps. Controversies in the Earth Sciences: A Reader. West Pub. Co, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.