APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Gregory, Kenneth J., and John Lewin. The Basics of Geomorphology: Key Concepts. Los Angeles: SAGE, 2014.

MLA (9th ed.) Citation

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