Cita APA (7th ed.)

(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.