APA (7 वां संस्करण) प्रशस्ति पत्र

Villanueva, R., Dulce, L., & Guzman, R. B. (2012). Rio+20: United Nations Conference on Sustainable Development. DZUP.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Villanueva, Raymund, Leon Dulce, और Rosario Bella Guzman. Rio+20: United Nations Conference on Sustainable Development. Quezon City: DZUP, 2012.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Villanueva, Raymund, et al. Rio+20: United Nations Conference on Sustainable Development. DZUP, 2012.