APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Gregory, Kenneth John, and John Lewin. The Basics of Geomorphology: Key Concepts. Los Angeles [u.a.]: Sage, 2014.

MLA (9th ed.) Citation

Gregory, Kenneth John, and John Lewin. The Basics of Geomorphology: Key Concepts. Sage, 2014.