APA (7th ed.) Citation

Emmons, W. H. (1921). Geology of petroleum (1st ed., 2nd impression.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Emmons, William Harvey. Geology of Petroleum. 1st ed., 2nd impression. New York [etc.]: McGraw-Hill, 1921.

MLA (9th ed.) Citation

Emmons, William Harvey. Geology of Petroleum. 1st ed., 2nd impression. McGraw-Hill, 1921.