Cita APA (7a ed.)

Spencer, E. W. (1986). Physical geology. Addison-Wesley Pub. Co..

Cita Chicago Style (17a ed.)

Spencer, Edgar Winston. Physical Geology. Reading, Mass.: Addison-Wesley Pub. Co., 1986.

Cita MLA (9a ed.)

Spencer, Edgar Winston. Physical Geology. Addison-Wesley Pub. Co., 1986.