The Cathars: The Most Successful Heresy of the Middle Ages
Sean Martin
A Short History of the Papacy in the Middle Ages
Walter Ullmann
The Crusades: An Encyclopedia - Volume I: A–C
Alan V. Murray
Revelacion y tradicion (Spanish Edition)
Karl Rahner & Joseph Ratzinger
Practical LaTeX
George A. Gratzer
Philosophy and the Social Problem
Will Durant
How We Think
John Dewey