History of the Intellectual Development of Europe, Volume II (of 2) Revised Edition

Ancient Rome and Modern America; A Comparative Study of Morals and Manners

Protestantism and Catholicity compared in their effects on the civilization of Europe

General History of Civilisation in Europe, From the Fall of the Roman Empire Till the French Revolution. A Treatise on Death Punishments.

History of the Intellectual Development of Europe, Volume I (of 2) Revised Edition

El Protestantismo comparado con el Catolicismo en sus relaciones con la Civilización Europea (Vols 1-2)