Cita APA (7a ed.)

Lutgens, F. K., & Tarbuck, E. J. (2011). Essentials of geology (11th ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Lutgens, Frederick K., y Edward J. Tarbuck. Essentials of Geology. 11th ed. Upper Saddle River, N.J: Prentice Hall, 2011.

Cita MLA (9a ed.)

Lutgens, Frederick K., y Edward J. Tarbuck. Essentials of Geology. 11th ed. Prentice Hall, 2011.