Cita APA (7th ed.)

Plummer, C. C. (1993). Physical geology. W.C. Brown.

Cita Chicago (17th ed.)

Plummer, Charles C. Physical Geology. Dubuque, IA: W.C. Brown, 1993.

Cita MLA (9th ed.)

Plummer, Charles C. Physical Geology. W.C. Brown, 1993.