Cita APA (7th ed.)

Sager, R. J., Ramsey, W. L., Phillips, C. R., & Watenpaugh, F. M. (2002). Modern earth science. Holt, Rinehart and Winston.

Cita Chicago (17th ed.)

Sager, Robert J., William L. Ramsey, Clifford R. Phillips, i Frank M. Watenpaugh. Modern Earth Science. Austin: Holt, Rinehart and Winston, 2002.

Cita MLA (9th ed.)

Sager, Robert J., et al. Modern Earth Science. Holt, Rinehart and Winston, 2002.