APA

Emmons W. H., Thiel G. A., Stauffer C. R. & Allison I. S. (1939). Geology. : McGraw-Hill Book Company.

Chicago

Emmons W H, Thiel G A, Stauffer C R and Allison I S. 1939. Geology. : McGraw-Hill Book Company.

Harvard

Emmons W. H., Thiel G. A., Stauffer C. R. and Allison I. S. (1939). Geology. : McGraw-Hill Book Company.

MLA

Emmons W H, Thiel G A, Stauffer C R and Allison I S. Geology. : McGraw-Hill Book Company. 1939.