APA (7e ed.) Bronvermelding

Gregory, K. J., & Lewin John. (2014). The basics of geomorphology: Key concepts (1a. ed.). Sage.

Chicago (17e ed.) Bronvermelding

Gregory, Kenneth J., en Lewin John. The Basics of Geomorphology: Key Concepts. 1a. ed. Londres: Sage, 2014.

MLA (9e ed.) Bronvermelding

Gregory, Kenneth J., en Lewin John. The Basics of Geomorphology: Key Concepts. 1a. ed. Sage, 2014.