- ''The Fall and Rise of the Five Great Empires of the Ancient World'' (1912)
- ''History of the Constellations'' (1919)
- ''The Real Atlantis: The Rediscovery of a Lost Continent'' (1922)
- ''The Cosmic View: The Universe in Forty Thousand Million Years'' (1931)
- ''Mythology of all Races'' (Editor) (1914–32)
- ''Ancient Roman Religion'' (1932)
- ''The New Testament Translated from the Latin Vulgate'' (1936)
- ''A Compendium of Theology'' (1937)
- ''The World Today: A History of the World from 1914 to the Present'' (1944)
- ''The Vatican and Fascism: A Study in Penance'' (1945)
- ''The Church in the Modern World: A Catholic History from 1945 to the Present'' (1947)
- ''The Priest in the Parish'' (1948)
- ''The Church and Social Justice: A Catholic Approach'' (1949)
- ''The Catholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, and History of the Catholic Church'' (Editor-in-chief) (1907–14)
Articles:
- "The Catholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, and History of the Catholic Church" (1907)
- "The Fall and Rise of the Five Great Empires of the Ancient World" (1912)
- "The Real Atlantis: The Rediscovery of a Lost Continent" (1922)
- "The Cosmic View: The Universe in Forty Thousand Million Years" (1931)
- "Ancient Roman Religion" (1932)
- "The Vatican and Fascism: A Study in Penance" (1945)
- "The World Today: A History of the World from 1914 to the Present" (1944)
- "The Church in the Modern World: A Catholic History from 1945 to the Present" (1947)
- "The Priest in the Parish" (1948)
- "The Church and Social Justice: A Catholic Approach" (1949)