Cita APA

Emmons, W. H. (1918). The principles of economic geology. New York: McGraw-Hill.

Citación estilo Chicago

Emmons, Williams Harvey. The Principles of Economic Geology. New York: McGraw-Hill, 1918.

Cita MLA

Emmons, Williams Harvey. The Principles of Economic Geology. New York: McGraw-Hill, 1918.