Cita APA

Spurr, J. E. (1920). Political and commercial geology and the world's mineral resources: A series of studies by specialists. New York: McGraw-Hill.

Citación estilo Chicago

Spurr, Josiah Edward. Political and Commercial Geology and the World's Mineral Resources: A Series of Studies By Specialists. New York: McGraw-Hill, 1920.

Cita MLA

Spurr, Josiah Edward. Political and Commercial Geology and the World's Mineral Resources: A Series of Studies By Specialists. New York: McGraw-Hill, 1920.