Dyfyniad APA

376727 Donovan, D. T. (1966). Stratigraphy: An introduction to principles. Chicago: Rand McNally.

Dyfyniad Arddull Chicago

376727 Donovan, Desmond Thomas. Stratigraphy: An Introduction to Principles. Chicago: Rand McNally, 1966.

Dyfyniad MLA

376727 Donovan, Desmond Thomas. Stratigraphy: An Introduction to Principles. Chicago: Rand McNally, 1966.

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