Maria Magdalena
Brock, Ann Graham. Mary Magdalene, The First Apostle: The Struggle for Authority. Cambridge, Massachusetts: Harvard University Press, 2003. ISBN 0-674-00966-5. Discusses issues of apostolic authority in the gospels and the Gospel of Peter the competition between Peter and Mary, especially in chapter 7, "The Replacement of Mary Magdalene: A Strategy for Eliminating the Competition."