Smith, G. A., & Pun, A. (2006). How does earth work?: Physical geology and the process of science. Upper Saddle River, NJ: Pearson/Prentice Hall.
استشهاد بنمط شيكاغوSmith, Gary A., و Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Upper Saddle River, NJ: Pearson/Prentice Hall, 2006.
MLA استشهادSmith, Gary A., و Aurora Pun. How Does Earth Work?: Physical Geology and the Process of Science. Upper Saddle River, NJ: Pearson/Prentice Hall, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.