APA (7th ed.) Citation

Papag, R., Felicia, R., & Padilla, A. (2001). Kwadradong daigdig. IBON Foundation Inc.

Chicago Style (17th ed.) Citation

Papag, Ron, R.E Felicia, and America Padilla. Kwadradong Daigdig. Manila: IBON Foundation Inc, 2001.

MLA (9th ed.) Citation

Papag, Ron, et al. Kwadradong Daigdig. IBON Foundation Inc, 2001.