Dyfyniad APA

Jeffreys, H. (1962). Earth: :Its origin history and physical constitution/4th ed (4th ed.). university press.

Dyfyniad Arddull Chicago

Jeffreys, Harold. Earth: :Its Origin History and Physical Constitution/4th Ed. 4th ed. Cambridge: university press, 1962.

Dyfyniad MLA

Jeffreys, Harold. Earth: :Its Origin History and Physical Constitution/4th Ed. 4th ed. university press, 1962.

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