APA-viite (7. p.)
Gardner, G., Prugh, T., Renner, M., & Mastny, L. (2015). State of the world 2015: Confronting hidden threats to sustainability. Island Press.
Chicago-viite (17. p.)
Gardner, G., Tom Prugh, Michael Renner, ja Lisa Mastny. State of the World 2015: Confronting Hidden Threats to Sustainability. Washington, District of Columbia: Island Press, 2015.
MLA-viite (9. p.)
Gardner, G., et al. State of the World 2015: Confronting Hidden Threats to Sustainability. Island Press, 2015.
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