Dyfyniad APA

Betts, E. A., & Esterer, L. A. (1941). Directed spelling activities (Glossary ed.). American Book Company.

Dyfyniad Arddull Chicago

Betts, Emmett A., and Louise A. Esterer. Directed Spelling Activities. Glossary ed. [New York ; Cincinnati, etc.]: American Book Company, 1941.

Dyfyniad MLA

Betts, Emmett A., and Louise A. Esterer. Directed Spelling Activities. Glossary ed. American Book Company, 1941.

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