Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.