http://www.szgdocent.org/pp/p-howler.htm
http://www.monkeyzone.com/capuchins.htm
http://encyclopedia.thefreedictionary.com/New%20World%20monkey
http://en.wikipedia.org/wiki/New_World_monkeys
http://www.csam.montclair.edu/ceterms/mammals/newworldmonkeys.html
http://www.mc.maricopa.edu/~reffland/anthropology/anthro2003/origins/primates/new_monkeys.html
http://www-ls.lanl.gov/wjt/page4.html
http://anthro.palomar.edu/primate/prim_5.htm