Sumber rujukan:
World Wildlife Fund (WWF): www.worldwildlife.org
United Nations Environment Programme (UNEP): www.unep.org
International Union for Conservation of Nature (IUCN): www.iucn.org
Conservation International: www.conservation.org
Journal of Applied Ecology: www.journalofappliedecology.org
Environmental Conservation journal: www.cambridge.org/core/journals/environmental-conservation
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