Cita APA (7th ed.)
Hager, D. (1938). Practical Oil-Geology. McGraw-Hill.
Cita Chicago (17th ed.)
Hager, Dorsey. Practical Oil-Geology. New York, London: McGraw-Hill, 1938.
Cita MLA (9th ed.)
Hager, Dorsey. Practical Oil-Geology. McGraw-Hill, 1938.
Atenció: Aquestes cites poden no estar 100% correctes.