Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

Welcome to the CDU Online Library

A theological library at your fingertips.


Welcome to the CDU Online Library's Reference Section, where you will find dictionaries, encyclopedias, and other compilations to help you research your topic. Items in this collection are considered tertiary sources and provide you with a broad overview of your topic.

Reference Collections

Commentaries in Electronic Database Format
Commentaries in eBook Format

Dictionaries in Electronic Database Format

Dictionaries in eBook Format

Encyclopedias in Electronic Database Format
Encyclopedias in eBook Format
Web-based Encyclopedias

Summa Theologiae from New Advent

The Summa Theologiæ of St. Thomas Aquinas
Second and Revised Edition, 1920
Literally translated by Fathers of the English Dominican Province
Online Edition Copyright © 2017 by Kevin Knight
Nihil Obstat. F. Innocentius Apap, O.P., S.T.M., Censor. Theol.
Imprimatur. Edus. Canonicus Surmont, Vicarius Generalis. Westmonasterii.
Nihil Obstat. F. Raphael Moss, O.P., S.T.L. and F. Leo Moore, O.P., S.T.L.
Imprimatur. F. Beda Jarrett, O.P., S.T.L., A.M., Prior Provincialis Angliæ

Under construction. Check back soon.

Under construction. Check back soon.

Under construction. Check back soon.