Dyfyniad APA

Selley, R. C. (1986). Elements of petroleum geology (2nd ed.). W. H. Freeman and Company.

Dyfyniad Arddull Chicago

Selley, Richard C. Elements of Petroleum Geology. 2nd ed. New York: W. H. Freeman and Company, 1986.

Dyfyniad MLA

Selley, Richard C. Elements of Petroleum Geology. 2nd ed. W. H. Freeman and Company, 1986.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.