APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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