Malleus Maleficarum

"The Malleus Maleficarum (Latin for “The Hammer of Witches”, or “Hexenhammer” in German) is one of the most famous medieval treatises on witches. It was written in 1486 by Heinrich Kramer and Jacob Sprenger, and was first published in Germany in 1487. Its main purpose was to challenge all arguments against the existence of witchcraft and to instruct magistrates on how to identify, interrogate and convict witches." (Quote from malleusmaleficarum.org)