Dyfyniad APA

Robertson,R. (2001). Correct and incorrect English. IVY Publishing house.

Dyfyniad Arddull Chicago

Robertson,R. Correct and Incorrect English. New Delhi: IVY Publishing house, 2001.

Dyfyniad MLA

Robertson,R. Correct and Incorrect English. IVY Publishing house, 2001.

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