Cita APA (7a ed.)
Worldwatch Institute. State of the World 2013: Is Sustainability Still Possible? Island Press.
Cita estilo Chicago (17a ed.)
Worldwatch Institute. State of the World 2013: Is Sustainability Still Possible? Washington, EUA: Island Press.
Cita MLA (9a ed.)
Worldwatch Institute. State of the World 2013: Is Sustainability Still Possible? Island Press.
Precaución: Estas citas no son 100% exactas.