APA استشهاد

Thompson, G. R. (1998). Introduction to physical geology. Saunders college.

استشهاد بنمط شيكاغو

Thompson, Graham R. Introduction to Physical Geology. Philadelphia: Saunders college, 1998.

MLA استشهاد

Thompson, Graham R. Introduction to Physical Geology. Saunders college, 1998.