Avila, D. M. (2000). Essentials of English: Worktext. Mutya Pub. House.
Lua i Stíl Chicago (17ú heag.)Avila, Dorcas M. Essentials of English: Worktext. Valenzuela City: Mutya Pub. House, 2000.
Lua MLA (9ú heag.)Avila, Dorcas M. Essentials of English: Worktext. Mutya Pub. House, 2000.
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