O culto celtibero das árvores: em essência, a dendolatria era (e ainda é) um culto de várias outras culturas xamânicas e também dos demais grupos célticos.

https://celticahispana.wordpress.com/2015/08/27/el-culto-celtiberico-a-los-arboles/

https://en.wikipedia.org/wiki/Tree_worship

http://www.ancient-wisdom.com/treelore.htm

http://www.sacred-texts.com/neu/celt/rac/rac16.htm

http://www.sacred-texts.com/neu/celt/ffcc/ffcc309.htm

https://engineerofknowledge.wordpress.com/2009/12/28/the-holy-oak-tree-religion/

http://www.fantompowa.net/Flame/heathcote_severed.htm


Obras:

"Celtic Tree Magic: Ogham Lore and Druid Mysteries"
 Kindle Edition
By Danu Forest  (Author)
http://www.amazon.com/Celtic-Tree-Magic-Ogham-Mysteries-ebook/dp/B00NJ2U6E6/ref=sr_1_1?s=books&ie=UTF8&qid=1440763775&sr=1-1&keywords=9780738744063

http://merganser.math.gvsu.edu/myth/trees.html

"The Fairy-Faith in Celtic Countries (Celtic, Irish)" Paperback – October 5, 2011

by W. Y. Evans-Wentz (Author)

http://www.amazon.com/Fairy-Faith-Celtic-Countries-Irish/dp/0486425223/ref=sr_1_1?s=books&ie=UTF8&qid=1440763659&sr=1-1&keywords=9780486425221