APA (7th ed.) Citation

Press, F., & Siever, R. (1997). Understanding earth (2a. ed.). W. H. Freeman.

Chicago Style (17th ed.) Citation

Press, Frank, and Raymond Siever. Understanding Earth. 2a. ed. Nueva York: W. H. Freeman, 1997.

MLA (9th ed.) Citation

Press, Frank, and Raymond Siever. Understanding Earth. 2a. ed. W. H. Freeman, 1997.