APA

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

Chicago

Spurr Josiah Edward, . 1920. Political and commercial geology and the world's mineral resources. New York: McGraw-Hill.

Harvard

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

MLA

Spurr Josiah Edward, . Political and commercial geology and the world's mineral resources. New York: McGraw-Hill. 1920.