While the books listed on the Primary Recommended Reading List are preferred, there are occasions where Dedicant's can and have requested to review alternative books.
Below are some of the books that have been approved as alternative resources by the Preceptor of ADF.
Classic Mythology: Images and Insights
by Stephen L. Harris and Gloria Platzner
In Search of Ancient Ireland
by Carmel McCaffrey
The Wisdom of the Celts (somewhat dated, not as recommended)
by Gina Sigillito
Introduction to Pagan Studies
by Barbara Jane Davy
These books were not approved for the purpose of the Dedicant's Program.
by Jean Markale
The Religion of the Ancient Celts
by J.A. MacCulloch
Omens, Oghams, and Oracles
by Richard Webster