World Wildlife Fund, ed. (2001). "Sahelian Acacia Savanna". WildWorld Ecoregion Profile. National Geographic Society. Archived from the original on March 8, 2010. Retrieved July 16, 2010.
World Wildlife Fund, ed. (2001). "Sahelian Acacia Savanna". WildWorld Ecoregion Profile. National Geographic Society. Archived from the original on March 8, 2010. Retrieved July 16, 2010.