Who were the co-authors of The Malleus Maleficarum or Hammer of Witches as noted in the nonfiction book, Witches, Midwives, and Nurses?

The Reverends Kramer and Sprenger are the co-authors of The Malleus Maleficarum or Hammer of Witches, a medieval text which served as "the unquestioned authority on how to conduct a witch hunt" (36).