APA (7e ed.) Bronvermelding

Petersen, J. F., Sack, D. I., & Gabler, R. E. (2012). Physical geography (Tenth edition.). Brooks/Cole Cengage Learning.

Chicago (17e ed.) Bronvermelding

Petersen, James F., Dorothy Irene Sack, en Robert E. Gabler. Physical Geography. Tenth edition. Belmont, California: Brooks/Cole Cengage Learning, 2012.

MLA (9e ed.) Bronvermelding

Petersen, James F., et al. Physical Geography. Tenth edition. Brooks/Cole Cengage Learning, 2012.