Start with high-confidence ethnic & tribal religions books, then narrow by subgenre or adjacent topics.
Mother Earth Spirituality
Ed McGaa
Ritual
Malidoma Patrice Some
Shamanism
Manvir Singh
The Forest of Symbols
Victor Turner
Orishas, Goddesses, and Voodoo Queens
Lilith Dorsey
Sacred Formulas of the Cherokees
James Reed Mooney
