APA

Sager R. J., Ramsey W. L., Phillips C. R. & Watenpaugh F. M. (2002). Modern Earth Science. New York: Holt Rinehart and Winston.

Chicago

Sager Robert J, Ramsey William L, Phillips Clifford R and Watenpaugh Frank M. 2002. Modern Earth Science. New York: Holt Rinehart and Winston.

Harvard

Sager R. J., Ramsey W. L., Phillips C. R. and Watenpaugh F. M. (2002). Modern Earth Science. New York: Holt Rinehart and Winston.

MLA

Sager Robert J, Ramsey William L, Phillips Clifford R and Watenpaugh Frank M. Modern Earth Science. New York: Holt Rinehart and Winston. 2002.