Dyfyniad APA

Billington, L. E. (1950). Word power through spelling. Silver Burdett Company.

Dyfyniad Arddull Chicago

Billington, Lillian E. Word Power Through Spelling. New York, Chicago, Dallas, San Francisco: Silver Burdett Company, 1950.

Dyfyniad MLA

Billington, Lillian E. Word Power Through Spelling. Silver Burdett Company, 1950.

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