Willis, H. (1971). Basic usage, vocabulary, and composition. Holt Rinehart and Winston.
Chicago Style (17. basım) AtıfWillis, Hulon. Basic Usage, Vocabulary, and Composition. New York: Holt Rinehart and Winston, 1971.
MLA (9th ed.) AtıfWillis, Hulon. Basic Usage, Vocabulary, and Composition. Holt Rinehart and Winston, 1971.
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