Despite the appealing visuals and iconography of the sabbath or witches communing with demons disguised as goats, one of the most credible sources about that topic is Carlo Ginzburg’s Ecstasies: Deciphering the Witches' Sabbath Book. The historian takes about 300 pages to show you that, according to documents that survived the passage of time, possibly there were no such things as night reunions in the forest, flying witches and groups organized as covens, but a few people who were getting high on mushrooms and ointments and seeing things.