1.) * The Electric Library - Encyclopedia.com - Results for Endorphins " http://www.encyclopedia.com/articles/04112.html "
2.) * Endorphins and Analgesia " http://www.iamot.org/~rhlogan/todd.html "
3.) * Endorphins: Natural Morphine Receptors " http://www.letsfindout.com/subjects/body/rfiopiod.html "
4.) * Recreating Bliss with Exercise and Endorphins " http://www.wenet.net/~bliss/exercise.html "