Henry Chadwick, Early Christian Thought and the Classical Tradition: Studies in Justin, Clement, and Origen (Oxford: Oxford University Press, 1984).
Robert Doran, Birth of a Worldview: Early Christianity in its Jewish and Pagan Context (Boulder, CO: Westview Press, 1995).
Mark J. Edwards, et al., eds., Apologetics in the Roman Empire: Pagans, Jews, and Christians (Oxford: Oxford University Press, 1999).
John Helgeland, 'Christians and the Roman Army A.D. 173-337', Church History, vol. 43, no. 2 (June 1974).