Erickson, F. J., & Vonk, J. A. (1996). Effective word 7.0. Irwin.
Tohutoru Kātū Chicago (17th ed.)Erickson, Fritz J., me John A. Vonk. Effective Word 7.0. Chicago: Irwin, 1996.
Tohutoro MLA (9th ed.)Erickson, Fritz J., me John A. Vonk. Effective Word 7.0. Irwin, 1996.
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