Παραπομπή APA

Smith, G. A., & Pun, A. (2010). How does earth work?: Physical geology and the process of science (2nd ed.). Pearson Prentice Hall.

Παραπομπή Chicago Style

Smith, Gary A., και Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. 2nd ed. Upper Saddle River, N.J.: Pearson Prentice Hall, 2010.

Παραπομπή MLA

Smith, Gary A., και Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. 2nd ed. Pearson Prentice Hall, 2010.