APA (7th ed.) Citation

Hager, D. (1951). Practical oil geology (6th ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Hager, Dorsey. Practical Oil Geology. 6th ed. New York: McGraw-Hill, 1951.

MLA (9th ed.) Citation

Hager, Dorsey. Practical Oil Geology. 6th ed. McGraw-Hill, 1951.