news://comp.software.extreme-programming
www.egroups.com/group/extremeprogramming
www.extremeprogramming.org, Don Wells’ site
www.junit.org, JUnit’s home.
www.refactoring.com, Martin Fowler’s refactoring catalog.
www.xpdeveloper.com
www.xprogramming.com, Ron Jeffries’ site
www.xp123.com, William C. Wake's site.
http://tech.groups.yahoo.com/group/extremeprogramming/, xp group.