Cita APA

Longwell, C. R., & Flint, R. F. Introduction to physical geology (6th ed.).

Citación estilo Chicago

Longwell, Chester R., y Richard F. Flint. Introduction to Physical Geology. 6th ed.

Cita MLA

Longwell, Chester R., y Richard F. Flint. Introduction to Physical Geology. 6th ed.