APA
Smith D. G., . (1981). The Cambridge encyclopedia of earth sciences. New York: Crown Publisher.
Chicago
Smith David G, . 1981. The Cambridge encyclopedia of earth sciences. New York: Crown Publisher.
Harvard
Smith D. G., . (1981). The Cambridge encyclopedia of earth sciences. New York: Crown Publisher.
MLA
Smith David G, . The Cambridge encyclopedia of earth sciences. New York: Crown Publisher. 1981.
