A continuación se listan las fuentes de información utilizadas.
https://www.mountaingoatsoftware.com/blog/differences-between-scrum-and-extreme-programming
http://c2.com/cgi/wiki?ChryslerComprehensiveCompensation
http://ingenieriadesoftware.blogia.com/2008/090201-historia-de-la-programacion-extrema.php
https://sites.google.com/site/xpmetodologia/marco-teorico/funcionamiento
https://sites.google.com/site/xpmetodologia/marco-teorico/ventajas
http://ronjeffries.com/xprog/articles/expdocumentationinxp/
Videos
Extreme Programming 