Cita APA (7a ed.)

Hilton, K., Orrell, K., & Tolley, H. (1987). Understanding landforms (1. publ., reprinted.). Macmillan.

Cita Chicago Style (17a ed.)

Hilton, Keith, Keith Orrell, y Harry Tolley. Understanding Landforms. 1. publ., reprinted. Basingstoke: Macmillan, 1987.

Cita MLA (9a ed.)

Hilton, Keith, et al. Understanding Landforms. 1. publ., reprinted. Macmillan, 1987.