I don't think there are any books out there about just black magick. You should try looking into books about witchcraft in general, and then decide with the knowledge you have gained what to do with it.
I don't know many books about just witchcraft, as I lean more towards the Wiccan path & witchcraft. But try Raymond Buckland.
There's always online sources though. If you ever feel like something may be un-realistic then you can always come on here and ask the people within the site.