Cita APA (7th ed.)

Villanueva, P. M., Acurantes, D. C., & Aranzaso, R. C. (2003). Writing skills for college (2nd ed.). Katha Publishing.

Cita Chicago (17th ed.)

Villanueva, Perla M., Dolores C. Acurantes, i Roberta C. Aranzaso. Writing Skills for College. 2nd ed. Quezon City: Katha Publishing, 2003.

Cita MLA (9th ed.)

Villanueva, Perla M., et al. Writing Skills for College. 2nd ed. Katha Publishing, 2003.