APA

Emmons W., . (1931). Geology of petroleum. New York: McGraw-Hill.

Chicago

Emmons William, . 1931. Geology of petroleum. New York: McGraw-Hill.

Harvard

Emmons W., . (1931). Geology of petroleum. New York: McGraw-Hill.

MLA

Emmons William, . Geology of petroleum. New York: McGraw-Hill. 1931.