Om en anglo-katolsk uppfattning se Hoffman Nickerson, The Inquisitionn: A Political and Military Study of its Establishment. Om en icke-katolsk uppfattning se Philip van Limborch, History of the Inquisition; Henry Charles Lea, A History of the Inquisition of the Middle Ages, 3 band; A History of the Inquisition of Spain, 4 band och The Inquisition in the Spanish Dependencies; och H. S. Turberville, Medieval Heresy and the Inquisition (London: C. Lockwood and Son, 1920 - en överbryggande synpunkt).