Cita APA (7th ed.)

Grotzinger, J., & Jordan, T. H. (2010). Understanding Earth (6a. ed.). W.H. Freeman and Company.

Cita Chicago (17th ed.)

Grotzinger, John, i Thomas H. Jordan. Understanding Earth. 6a. ed. Nueva York: W.H. Freeman and Company, 2010.

Cita MLA (9th ed.)

Grotzinger, John, i Thomas H. Jordan. Understanding Earth. 6a. ed. W.H. Freeman and Company, 2010.