Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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