Gaya APA

Emmons, W, H., Thiel, G, A. (1955). Geology : Principles and Processes . New York, USA: McGraw-Hill Book Company.

Gaya MLA

Emmons, William, H.., Thiel, George, A.. "Geology : Principles and Processes". New York, USA: McGraw-Hill Book Company, 1955. Text.