(2005). Prentice Hall earth science. Pearson Prentice Hall.
Cita Chicago (17th ed.)Prentice Hall Earth Science. Boston: Pearson Prentice Hall, 2005.
Cita MLA (8th ed.)Prentice Hall Earth Science. Pearson Prentice Hall, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.