Avila, D. M., Cruz, M. B. L., & Trajano, M. G. (2003). Essentials of English: Study and thinking skills. Mutya Publ. House.
Lua i Stíl Chicago (17ú heag.)Avila, Dorcas M., Ma. Beatriz L. Cruz, agus Mercedes G. Trajano. Essentials of English: Study and Thinking Skills. Valenzuela City: Mutya Publ. House, 2003.
Lua MLA (9ú heag.)Avila, Dorcas M., et al. Essentials of English: Study and Thinking Skills. Mutya Publ. House, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.