Sources Sanderson, Peter ( April 17, 2006). X-Men: The Ultimate Guide. DK CHILDREN (3rd ed.). . Barney-Hawke, Syd, Moreels, Eric J. ( April 1, 2003). Marvel Encyclopedia Volume 2: X-Men. Marvel Comics. . Yaco, Linc, Haber, Karen (February 2004). The Science of the X-Men. I Books/Marvel. . Marvel Entertainment ( May 7, 2003). The Marvel Universe Roleplaying Game. Marvel Comics. .
Sources Sanderson, Peter ( April 17, 2006). X-Men: The Ultimate Guide. DK CHILDREN (3rd ed.). . Barney-Hawke, Syd, Moreels, Eric J. ( April 1, 2003). Marvel Encyclopedia Volume 2: X-Men. Marvel Comics. . Yaco, Linc, Haber, Karen (February 2004). The Science of the X-Men. I Books/Marvel. . Marvel Entertainment ( May 7, 2003). The Marvel Universe Roleplaying Game. Marvel Comics. .