Ecosystems and Biodiversity Lesson 4 : Michigan's Ecosystems - What Have They Done For YOU Lately?
Daily, G., et al. (Spring 1997) “Ecosystem Services: Benefits Supplied to Human Societies by Natural Ecosystems.” Issues in Ecology. (Ecological Society of America). Retrieved July 18, 2018, from https://www.esa.org/esa/wp-content/uploads/2013/03/issue2.pdf
World Wildlife Fund. (1999). “Biodiversity Performs! Lesson.” Windows on the Wild: Biodiversity Basics. Tustin, CA: Acorn Naturalists.