Dyfyniad APA
Swan, M. (2016). Practical english usage (4th ed.). Oxford University Press.
Dyfyniad Arddull Chicago
Swan, Michael. Practical English Usage. 4th ed. United Kingdom: Oxford University Press, 2016.
Dyfyniad MLA
Swan, Michael. Practical English Usage. 4th ed. Oxford University Press, 2016.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.