APA (7th ed.) Citation

Spencer, E. W. (2003). Earth science: Understanding environtmental systems. McGraw-Hill.

Chicago Style (17th ed.) Citation

Spencer, Edgar W. Earth Science: Understanding Environtmental Systems. Boston, MA: McGraw-Hill, 2003.

MLA (8th ed.) Citation

Spencer, Edgar W. Earth Science: Understanding Environtmental Systems. McGraw-Hill, 2003.