APA (7th ed.) Citation

Ries, H. (1930). Economic geology (6th ed., rev.). Wiley.

Chicago Style (17th ed.) Citation

Ries, Heinrich. Economic Geology. 6th ed., rev. New York: Wiley, 1930.

MLA (8th ed.) Citation

Ries, Heinrich. Economic Geology. 6th ed., rev. Wiley, 1930.