Cita APA (7th ed.)

Lutgens, F. K., & Tarbuck, E. J. (1998). Essentials of geology (6th ed.). Prentice Hall.

Cita Chicago (17th ed.)

Lutgens, Frederick K., i Edward J. Tarbuck. Essentials of Geology. 6th ed. Upper Saddle River, N.J: Prentice Hall, 1998.

Cita MLA (9th ed.)

Lutgens, Frederick K., i Edward J. Tarbuck. Essentials of Geology. 6th ed. Prentice Hall, 1998.