Essentials of geology /
Frederick K. Lutgens, Edward J. Tarbuck.
APA Citation
Lutgens, F. K., Tarbuck, E. J. (1989). Essentials of geology. 3rd ed. Columbus: Merrill Pub. Co..
MLA Citation
Lutgens, Frederick K, and Edward J Tarbuck. Essentials of Geology. 3rd ed. Columbus: Merrill Pub. Co., 1989.
Warning: These citations may not always be complete (especially for serials).