Cita APA (7a ed.)

Hess, D., & Mcknight, T. L. Mcknight's physical geography: A landscape appreciation (20º ed.).

Cita Chicago Style (17a ed.)

Hess, Darrel, y Tom L. Mcknight. Mcknight's Physical Geography: A Landscape Appreciation. 20º ed.

Cita MLA (9a ed.)

Hess, Darrel, y Tom L. Mcknight. Mcknight's Physical Geography: A Landscape Appreciation. 20º ed.