McGeary, D., & Plummer, C. C. (1992). Physical geology: Earth revealed. Wm. C. Brown.
Lua i Stíl Chicago (17ú heag.)McGeary, David, agus Charles C. Plummer. Physical Geology: Earth Revealed. Boulevard: Wm. C. Brown, 1992.
Lua MLA (9ú heag.)McGeary, David, agus Charles C. Plummer. Physical Geology: Earth Revealed. Wm. C. Brown, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.