Dunbar, C. O., & Rodgers, J. (1957). Principles of stratigraphy. Wiley.
Cita Chicago (17th ed.)Dunbar, Carl Owen, i John Rodgers. Principles of Stratigraphy. New York: Wiley, 1957.
Cita MLA (9th ed.)Dunbar, Carl Owen, i John Rodgers. Principles of Stratigraphy. Wiley, 1957.
Atenció: Aquestes cites poden no estar 100% correctes.