• A History of the Inquisition of Spain; vol. 1
• A History of the Inquisition of Spain; vol. 2
• A History of the Inquisition of Spain; vol. 3
• A History of the Inquisition of Spain; vol. 4
• A History of the Inquisition of the Middle Ages; volume I
• A History of the Inquisition of the Middle Ages; volume II
• A History of the Inquisition of the Middle Ages; volume III
• An Historical Sketch of Sacerdotal Celibacy in the Christian Church
• Superstition and Force: Essays on the Wager of Law, the Wager of Battle, the Ordeal, Torture
• The inquisition in the Spanish dependencies: Sicily—Naples—Sardinia—Milan—the Canaries—Mexico—Peru—New Granada