APA (7th ed.) Citation

Ongsotto, R. R., Ongsotto, R. R., & Ongsotto, R. M. (2005). The study of Philippine history. Rex Book Store.

Chicago Style (17th ed.) Citation

Ongsotto, Rebecca R., Reena R. Ongsotto, and Rowena Maria Ongsotto. The Study of Philippine History. Manila: Rex Book Store, 2005.

MLA (9th ed.) Citation

Ongsotto, Rebecca R., et al. The Study of Philippine History. Rex Book Store, 2005.