APA

Hager D., . (1939). Fundamentals of the petroleum industry. New York: McGraw-Hill.

Chicago

Hager Dorsey, . 1939. Fundamentals of the petroleum industry. New York: McGraw-Hill.

Harvard

Hager D., . (1939). Fundamentals of the petroleum industry. New York: McGraw-Hill.

MLA

Hager Dorsey, . Fundamentals of the petroleum industry. New York: McGraw-Hill. 1939.