Cita APA

Spencer, E. W., & Spencer, E. H. (1972). The dynamics of the earth: An introduction to physical geology. New York: Thomas Y. Crowell Company.

Citación estilo Chicago

Spencer, Edgar Winston, y Elizabeth Humphris Spencer. The Dynamics of the Earth: An Introduction to Physical Geology. New York: Thomas Y. Crowell Company, 1972.

Cita MLA

Spencer, Edgar Winston, y Elizabeth Humphris Spencer. The Dynamics of the Earth: An Introduction to Physical Geology. New York: Thomas Y. Crowell Company, 1972.