An Encyclopedia of Archetypal Symbolism. A beautiful and stimulating book. Encyclopedia of Creation Myths. The Encyclopedia of Religion . A sixteen-volume work edited by Mircea Eliade, a world authority on myth.
Typical entry is a long, multi-page article.
Goddesses in World Mythology. Ref BL 80.2 F28 Larousse World Mythology. A Dictionary of Egyptian Gods and Goddesses. No-frills but reliable and plenty of information. Who in Egyptian Mythology.