Cita APA

Emmons, W. H. (1940). The Principles of economics geology. New York: McGraw-Hill.

Citación estilo Chicago

Emmons, William Harvey. The Principles of Economics Geology. New York: McGraw-Hill, 1940.

Cita MLA

Emmons, William Harvey. The Principles of Economics Geology. New York: McGraw-Hill, 1940.