Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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