Cita APA (7th ed.)

Clark, T. H., & Stearn, C. W. (1968). The geological evolution of North America: A regional approach to historical geology. Ronald Press Co.

Cita Chicago (17th ed.)

Clark, Thomas Henry, i Colin William Stearn. The Geological Evolution of North America: A Regional Approach to Historical Geology. New York: Ronald Press Co, 1968.

Cita MLA (9th ed.)

Clark, Thomas Henry, i Colin William Stearn. The Geological Evolution of North America: A Regional Approach to Historical Geology. Ronald Press Co, 1968.