Avila, D. M. (2000). Essentials of English: Worktext. Mutya Pub. House.
Chicagoスタイル(17版)引用形式Avila, Dorcas M. Essentials of English: Worktext. Valenzuela City: Mutya Pub. House, 2000.
MLA(9版)引用形式Avila, Dorcas M. Essentials of English: Worktext. Mutya Pub. House, 2000.
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