APA (7th ed.) Citation

Sills, A. D. (2003). Earth science the easy way. Barron's.

Chicago Style (17th ed.) Citation

Sills, Alan D. Earth Science the Easy Way. Hauppauge, N.Y: Barron's, 2003.

MLA (9th ed.) Citation

Sills, Alan D. Earth Science the Easy Way. Barron's, 2003.