Cita APA (7th ed.)

Dunbar, C. O. (1957). Principles pf Stratigraphy (1st.). John Wiley & Sons, INC.

Cita Chicago (17th ed.)

Dunbar, Carl O. Principles Pf Stratigraphy. 1st. New York: John Wiley & Sons, INC, 1957.

Cita MLA (9th ed.)

Dunbar, Carl O. Principles Pf Stratigraphy. 1st. John Wiley & Sons, INC, 1957.