APA (7th ed.) Citation

Petersen, J. F., Gabler, R. E., & Sack, D. I. (2022). Physical geography (Twelfth edition.). Cengage.

Chicago Style (17th ed.) Citation

Petersen, James F., Robert E. Gabler, and Dorothy Irene Sack. Physical Geography. Twelfth edition. Boston, Massachusetts: Cengage, 2022.

MLA (9th ed.) Citation

Petersen, James F., et al. Physical Geography. Twelfth edition. Cengage, 2022.