- Man’s Vision of God and the Logic of Theism Charles Hartshorne (1941) [Hartshorne 1]
- The Doctrine of God, Albert C. Knudson (1931)
- The Universe Unfolding, Robert H. Baker (1932)
- Stars and Atoms, Sir Arthur S. Eddington (1927)
- The Universe Around Us, Sir James Jeans (1930)
- Through Space and Time, Sir James Jeans
- The New Dictionary of Thoughts
- The Corridors of Time, Harold Peake and Herbert John Fleure
- Men of the Old Stone Age, Henry Fairfield Osborn
- Man Rises to Parnassus, Henry Fairfield Osborn
- The Science of Society, William Graham Sumner and Albert Galloway Keller (1927)
- A Harmony of the Gospels for Historical Study, Arnold Stevens and Ernest DeWitt Burton (1904, 1932)
- Atlas of the Historical Geography of the Holy Land, George Adam Smith (1915)
- The Perfect Calendar for Every Year of the Christian Era, Henry Fitch (1926, 1927)
- Dictionary of The Bible, James Hastings (1909)
- A Dictionary Of The Bible, William Smith (1870)
- The Life and Times of Jesus the Messiah, Alfred Edersheim
¶ Paralells between The Urantia Book and books supposed sources
¶ Articles