Dyfyniad APA

Swan, M., & Seidl, J. (1986). Basic English usage: Exercises : with key. Oxford: Oxford University Press.

Dyfyniad Arddull Chicago

Swan, Michael., và Jennifer Seidl. Basic English Usage: Exercises : With Key. Oxford: Oxford University Press, 1986.

Dyfyniad MLA

Swan, Michael., và Jennifer Seidl. Basic English Usage: Exercises : With Key. Oxford: Oxford University Press, 1986.

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