APA
Plummer C. C., McGeary D. j. a., . (1993). Physical geology. Dubuque, IA: WM. C. Brown Publishers.
Chicago
Plummer Charles C, McGeary David jt author, . 1993. Physical geology. Dubuque, IA: WM. C. Brown Publishers.
Harvard
Plummer C. C., McGeary D. j. a., . (1993). Physical geology. Dubuque, IA: WM. C. Brown Publishers.
MLA
Plummer Charles C, McGeary David jt author, . Physical geology. Dubuque, IA: WM. C. Brown Publishers. 1993.