Below are some links that we have found to be very useful and informative about the Andalusian breed.
http://www.prehorse.org (The Foundation for the Pure Spanish Horse)
http://www.rancho-del-lago.com (Rancho del Lago Stables)
http://www.dressagefoundation.org (Dressage Foundation)
http://www.ialha.org (International Andalusian & Lusitano Horse Association)
https://www.youtube.com/user/david12000000 (David Archer, Horse Training Expert)