Cita APA (7a ed.)

Dunbar, C. O. (1961). Principles of stratigraphy (4th.ed.). John Wiley & Sons, Inc..

Cita Chicago Style (17a ed.)

Dunbar, Carl O. Principles of Stratigraphy. 4th.ed. New York: John Wiley & Sons, Inc., 1961.

Cita MLA (8a ed.)

Dunbar, Carl O. Principles of Stratigraphy. 4th.ed. John Wiley & Sons, Inc., 1961.