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<http://www.fow.org/about-park/wissahickon-gorge/plants-and-wildlife/wildlife>.
Lee, G. F. Eutrophication. Madison: University of Wisconsin, 2008. Print.
McGuffin, David. "Limiting Factors of Temperate Forests." EHow. Demand Media, 06 Apr. 2011. Web. 17 Sept. 2012.<http://www.ehow.com/info_8176512_limiting-factors-temperate-forests.html%20>.
Molles, Manuel C. Ecology: Concepts and Applications. N.p.: WCB/McGraw-Hill, 1999. Print.
Nature.com. Nature Publishing Group, n.d. Web. 17 Sept. 2012. <http://www.nature.com/scitable/knowledge/library/population-limiting-factors-17059572>.
Reece, Jane B., Michael L. Cain, Lisa A. Urry, Seven A. Wasserman, Peter V. Minorsky, and Robert B. Jackson. Campbell Biology. Vol. 9. N.p.: Pearson Benjamin Cummings, 2010. Print.
"Succession." Succession. N.p., n.d. Web. 17 Sept. 2012. <http://www.marietta.edu/~biol/biomes/succession.htm>.
"Temperate Broadleaf Forest." - University of Puget Sound. N.p., n.d. Web. 17 Sept. 2012. <http://www.pugetsound.edu/academics/academic-resources/slater-museum/biodiversity-resources/world-biomes/characteristics-of-bioclimatic/temperate-broadleaf-forest/>.
Walker, Lawrence R., and Rodger del Moral. Primary Succession and Ecosystem Rehabilitation. N.p.: Cambridge UP, 2003. Print.
"What Do Frogs Eat and What Eats Frogs?" What Do Frogs Eat and What Eats Frogs?Frog Life Cycle, n.d. Web. 15 Sept. 2012. <http://www.frog-life-cycle.com/what-frogs-eat.html>.
"Wildlife." Friends of the Wissahickon. Friends of the Wissahickon, n.d. Web. 14 Sept. 2012. <http://www.fow.org/about-park/wissahickon-gorge/plants-and-wildlife/wildlife>
Woodward, Susan L. "Temperate Broadleaf Deciduous Forest." Biomes of the World. Department of Geospacial Science, Radford University, n.d. Web. 15 Sept. 2012. <https://php.radford.edu/~swoodwar/biomes/?page_id=94>.