1. Appendix 1;Baker,1979
2. Harlan, Inc. Sprague-Dawley growth chart. Available at: http://www.harlan.com/strain%20details/rats/sd.html. Accessed March 22, 2005.
3. Halls S. Men’s weight chart. Available at: http://www.halls.md/chart/men-weight-w.htm. Accessed March 22, 2005.
4. At what age is the developing cerebral cortex of the rat comparable to that of the full-term newborn human baby?;Romijn;Early Hum Dev,1991
5. American Academy of Pediatrics. Revised breastfeeding recommendations. Available at: http://www.aap.org/advocacy/releases/feb05breastfeeding.htm. Accessed March 22, 2005.