Sources

Sources:

[1] Dr. Gillespie's Geography 5 Lecture 

[2] http://worldwildlife.org/ecoregions/at0722

[3] http://wwf.panda.org/about_our_earth/ecoregions/sudanian_savannas.cfm

[4] http://www.sciencedirect.com/science/article/pii/S1433831908000358
[5] Linda R. Berg, David M. Hassenzahl, Mary C. Hager."Visualizing Environmental Science" 3rd. ed. Wiley Visualizing. September 2010.