APA-referens

Smith, G. A., & Pun, A. (2006). How does earth work?: Physical geology and the process of science. Upper Saddle River, NJ: Pearson/Prentice Hall.

Chicago-stil citat

Smith, Gary A., och Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Upper Saddle River, NJ: Pearson/Prentice Hall, 2006.

MLA-referens

Smith, Gary A., och Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Upper Saddle River, NJ: Pearson/Prentice Hall, 2006.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.