Cita APA (7th ed.)

Plummer, C. C. (1979). Physical geology. Wa. C. Brown.

Cita Chicago (17th ed.)

Plummer, Charles C. Physical Geology. Dubuque: Wa. C. Brown, 1979.

Cita MLA (9th ed.)

Plummer, Charles C. Physical Geology. Wa. C. Brown, 1979.