[Langton]. Langton, Chris. "What Is Artificial Life," available online at http://www.biota.org/papers/cgalife.html (accessed January 17, 2003 )
[MacLennan] MacLennan, Bruce. "Artificial Life and Synthetic Ethology," available online at http:www.cs.utk.edu/~mclennan/alife.html (accessed January 17, 2003 )