Chronic, H. Prairie, Peak, and Plateau: A Guide to the Geology of Colorado.
Lua i Stíl Chicago (17ú heag.)Chronic, Halka. Prairie, Peak, and Plateau: A Guide to the Geology of Colorado.
Lua MLA (9ú heag.)Chronic, Halka. Prairie, Peak, and Plateau: A Guide to the Geology of Colorado.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.