Dyfyniad APA

International Union of Geological Society. (1985). Episodes,vol.8&9.

Dyfyniad Arddull Chicago

International Union of Geological Society. Episodes,vol.8&9. International Union of Geological Society, 1985.

Dyfyniad MLA

International Union of Geological Society. Episodes,vol.8&9. 1985.

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