Sheeler, W. D. (1991). WELCOME TO ENGLISH BOOK 4. English Language Service.
Chicagoスタイル(17版)引用形式Sheeler, Willard D. WELCOME TO ENGLISH BOOK 4. English Language Service, 1991.
MLA(8版)引用形式Sheeler, Willard D. WELCOME TO ENGLISH BOOK 4. English Language Service, 1991.
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