Dyfyniad APA

Henry, D. J., & Pongratz, S. (2007). Developing vocabulary. Pearson/Longman.

Dyfyniad Arddull Chicago

Henry, D. J., and Susan Pongratz. Developing Vocabulary. New York: Pearson/Longman, 2007.

Dyfyniad MLA

Henry, D. J., and Susan Pongratz. Developing Vocabulary. Pearson/Longman, 2007.

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