Start with high-confidence celtic spirituality books, then narrow by subgenre or adjacent topics.
Celtic Daily Prayer
Northumbria Communit, The Northumbria Community
Sacred Earth, Sacred Soul
John Philip Newell
The Celtic Way of Prayer
Esther De Waal
A Celtic Eucharist
Brendan O'Malley, Brendan O'Malley
The Spirit of the Celtic Gods and Goddesses
Carl McColman, Kathryn Hinds
Druidry Handbook
John Michael Greer
Celtic Goddess Grimoire
Annwyn Avalon
A Druid's Herbal of Sacred Tree Medicine
Ellen Evert Hopman
Ancient Legends of Ireland
Lady Jane Francesca Agnes Wilde
Pagan Portals - Rhiannon
Jhenah Telyndru
Healing Plants of the Celtic Druids
Angela Paine
Pagan Portals - Raven Goddess
Morgan Daimler
Pagan Portals - Arianrhod
Kristoffer Hughes
Celtic Spirit Oracle
Nicola McIntosh
The Celtic Wheel of the Year
Rhonda McCrimmon
