If you're interested in the history and roots of Wicca I would recommend the following books:
"Triumph of the Moon" by Ronald Hutton
"Gerald Gardner and the Cauldron of Inspiration" by Philip Heselton
"Gerald Gardner: Witch" by Jack Bracelin
"Wiccan Roots" by Philip Heselton
"Witch Father, a Life of Gerald Gardner" by Philip Heselton
