APA (7th ed.) Citation

Villanueva, P. M., Acurantes, D. C., & Aranzaso, R. C. (2009). Improving your writing skills. Books Atbp. Pub.

Chicago Style (17th ed.) Citation

Villanueva, Perla M., Dolores C. Acurantes, and Roberta C. Aranzaso. Improving Your Writing Skills. Mandaluyong City: Books Atbp. Pub, 2009.

MLA (9th ed.) Citation

Villanueva, Perla M., et al. Improving Your Writing Skills. Books Atbp. Pub, 2009.