what type of magickal book exactly? a spell book? a specific religion? or a book pertaining to magick in some form? also, how long have you been studying? were you hoping for a beginners guide or something more advanced?
either way, here's Buckland's Complete Book of Witchcraft in pdf format: https://cdn.preterhuman.net/texts/religion.occult.new_age/Magick/Bucklands%20Complete%20Book%20of%20Witchcraft.pdf