Cita APA (7a ed.)

Judson, S., & Kauffman, M. E. (1990). Physical geology (Eighth edition.). Prentice Hall.

Cita Chicago Style (17a ed.)

Judson, Sheldon, y Marvin Earl Kauffman. Physical Geology. Eighth edition. Englewood Cliffs, N.J.: Prentice Hall, 1990.

Cita MLA (9a ed.)

Judson, Sheldon, y Marvin Earl Kauffman. Physical Geology. Eighth edition. Prentice Hall, 1990.