Cita APA (7a ed.)

Twidale, C. R., & Foale, M. R. (1969). Landforms illustrated. Nelson.

Cita Chicago Style (17a ed.)

Twidale, C. R., y M. R. Foale. Landforms Illustrated. Melbourne ; London: Nelson, 1969.

Cita MLA (8a ed.)

Twidale, C. R., y M. R. Foale. Landforms Illustrated. Nelson, 1969.