APA (7th ed.) Citation

Rivero, G. C., & Cao, E. P. (2005). Biology: A study guide (2nd ed.). University of the Philippines Open University.

Chicago Style (17th ed.) Citation

Rivero, Gilda C., and Ernelea P. Cao. Biology: A Study Guide. 2nd ed. Diliman, Quezon City: University of the Philippines Open University, 2005.

MLA (9th ed.) Citation

Rivero, Gilda C., and Ernelea P. Cao. Biology: A Study Guide. 2nd ed. University of the Philippines Open University, 2005.