(2005). Prentice Hall earth science. Pearson Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Prentice Hall Earth Science. Boston: Pearson Prentice Hall, 2005.
Lua MLA (8ú heag.)Prentice Hall Earth Science. Pearson Prentice Hall, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.