Billington, P. (2011). The Path of Druidry: Walking the Ancient Green Way. Llewellyn Publications
Forest, D. (2014). Celtic Tree Magic: Ogham Lore and Druid Mysteries. LLewelyn Publications.
Greer, John M. (2008). The Druid Magic Handbook: Ritual Magic Rooted in the Living Earth
Murray, C. & Murray, L. (2021). The Celtic Tree Oracle: A System of Divination. Red Wheel