* Bruun, Patrick. ''"The Christian Signs on the Coins of Constantine."'' '''Arctos''', Series 2, vol.3 (1962), pp.5-35.
* Elliott, Thomas George. ''[http://books.google.ca/books?id=R_bFQgAACAAJ&source=gbs_navlinks_s The Christianity of Constantine the Great].'' University of Scranton Press, 1996. 366pp. ISBN 9780940866591
:''Professor Elliott (University of Toronto) argues that Constantine's "miraculous" conversion (before the final definitive battle in 312 with his rival Maxentius for the senior Augustuship of the Roman Empire) is the stuff of legend; and the reality is that there are many indications that Constantine's Christianity developed earlier and along normal lines. This is more than a scholarly debate over dates. It focuses on the point that this more mature character of Constantine's Christian faith, had an important shaping impact on his imperial policy toward Christianity.''