APA-referens (7:e uppl.)

Avila, D. M. (2000). Essentials of English: Worktext. Mutya Pub. House.

Chicago-referens (17:e uppl.)

Avila, Dorcas M. Essentials of English: Worktext. Valenzuela City: Mutya Pub. House, 2000.

MLA-referens (9:e uppl.)

Avila, Dorcas M. Essentials of English: Worktext. Mutya Pub. House, 2000.