Avila, D. M. (2000). Essentials of English: Worktext. Mutya Pub. House.
芝加哥风格引文Avila, Dorcas M. Essentials of English: Worktext. Valenzuela City: Mutya Pub. House, 2000.
MLA引文Avila, Dorcas M. Essentials of English: Worktext. Mutya Pub. House, 2000.
警告：这些引文格式不一定是100％准确.