APA-referens (7:e uppl.)

Plummer, C. C., Carlson, D. H., & Hammersley, L. (2013). Physical geology (14th ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Plummer, Charles C., Diane H. Carlson, och Lisa Hammersley. Physical Geology. 14th ed. New York: McGraw-Hill, 2013.

MLA-referens (9:e uppl.)

Plummer, Charles C., et al. Physical Geology. 14th ed. McGraw-Hill, 2013.