3.3 Increasing and Decreasing Functions & The First Deriavative Test

http://archives.math.utk.edu/visual.calculus/3/graphing.13/index.html

http://archives.math.utk.edu/visual.calculus/3/graphing.5/

http://www.math.hmc.edu/calculus/tutorials/extrema/

http://www.kent.k12.wa.us/staff/dwright/calculus/book/3.3/