1. Stem cells and cloning: What's the difference and why the fuss?
2. 1999b. Human embryology and developmental biology. 2nd ed. St. Louis: Mosby.
3. 2002. Edgewarp3.19. [Executable module and manuals.] {ftp://brainmap.med.umich.edu/ pub/edgewarp3.19}.
4. 2001. Human embryology. 3rd ed. New York: Churchill Livingstone.
5. 1998. The developing human. 6th ed. Philadelphia: Saunders.