Dyfyniad APA
Allaby, M. (1990). A dictionary of earth sciences (3rd ed.). Oxford University Press.
Dyfyniad Arddull Chicago
Allaby, Michael. A Dictionary of Earth Sciences. 3rd ed. Oxford: Oxford University Press, 1990.
Dyfyniad MLA
Allaby, Michael. A Dictionary of Earth Sciences. 3rd ed. Oxford University Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.