Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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