Smith, G. A., & Pun, A. (2006). How does Earth work?: Physical geology and the process of science. Pearson Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Smith, Gary A., agus Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Upper Saddle River, N.J: Pearson Prentice Hall, 2006.
Lua MLA (9ú heag.)Smith, Gary A., agus Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Pearson Prentice Hall, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.