Dyfyniad APA

University of Chicago Press. (1973). Journal of Geology,vol.81(1,2,5,6).

Dyfyniad Arddull Chicago

University of Chicago Press. Journal of Geology,vol.81(1,2,5,6). University of Chicago Press, 1973.

Dyfyniad MLA

University of Chicago Press. Journal of Geology,vol.81(1,2,5,6). 1973.

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