Gaya APA

Wicander, R., Monroe, J, S. (1989). Historical Geology: Evolution of the Eartrh and Life Through Time (1). America: West Publishing Company.

Gaya MLA

Wicander, Reed., Monroe, James, S.. "Historical Geology: Evolution of the Eartrh and Life Through Time". 1 America: West Publishing Company, 1989. Text.