Dyfyniad APA

Wittenberg, W. (1980). A prescriptive spelling program (Teacher's ed.). Barnell Loft.

Dyfyniad Arddull Chicago

Wittenberg, William. A Prescriptive Spelling Program. Teacher's ed. Baldwin, N.Y.: Barnell Loft, 1980.

Dyfyniad MLA

Wittenberg, William. A Prescriptive Spelling Program. Teacher's ed. Barnell Loft, 1980.

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