Gaya APA

Dixon, D., Bernor, R, L. (1992). The practical geologist : the introductory guide to the basics of geology and to collecting and identifying rocks . New York: Simon and Schuster.

Gaya MLA

Dixon, Dougal., Bernor, Raymond, L.. "The practical geologist : the introductory guide to the basics of geology and to collecting and identifying rocks". New York: Simon and Schuster, 1992. Text.