Holt, Rinehart, and Winston, inc. (2007). Earth science. Holt, Rinehart and Winston.
Cita Chicago (17th ed.)Holt, Rinehart, and Winston, inc. Earth Science. Orlando, FL: Holt, Rinehart and Winston, 2007.
Cita MLA (9th ed.)Holt, Rinehart, and Winston, inc. Earth Science. Holt, Rinehart and Winston, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.