12. See, for example, Irenaeus, Against Heresies; Clement of Alexandria, The Stromata, or Miscellanies; Tertullian, Against Marcion 1–5, Against Valentinius, Prescription of Heresies, Scorpiace. All of these are available in The Ante-Nicene Fathers, eds. A. Roberts and J. Donaldson (Grand Rapids, Michigan: Eerdmans, 1953), I–III.