Cita APA (7a ed.)

Schuchert, C., & Dunbar, C. O. (1947). A textbook of geology: Historical geology. John Wiley.

Cita Chicago Style (17a ed.)

Schuchert, Charles, y Carl O. Dunbar. A Textbook of Geology: Historical Geology. Nueva York: John Wiley, 1947.

Cita MLA (8a ed.)

Schuchert, Charles, y Carl O. Dunbar. A Textbook of Geology: Historical Geology. John Wiley, 1947.