Cita APA (7th ed.)

LONGWELL, C. R. (1939). A Textbook of geology. John Wiley.

Cita Chicago (17th ed.)

LONGWELL, Chester R. A Textbook of Geology. London: John Wiley, 1939.

Cita MLA (9th ed.)

LONGWELL, Chester R. A Textbook of Geology. John Wiley, 1939.