Cita APA (7a ed.)

Busch, R. M., Tarbuck, E. J., & Lutgens, F. K. (1999). Study guide: Earth an introduction to physical geology (6th. ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Busch, Richard M., Edward J. Tarbuck, y Frederick K. Lutgens. Study Guide: Earth an Introduction to Physical Geology. 6th. ed. Upper Saddle River, NJ: Prentice Hall, 1999.

Cita MLA (8a ed.)

Busch, Richard M., et al. Study Guide: Earth an Introduction to Physical Geology. 6th. ed. Prentice Hall, 1999.