Sources:
- Howard Crosby Butler: Early Churches in Syria. Fourth to Seventh Centuries. Princeton University Press, Princeton 1929, p.76
- Richard Bernheimer, “An Ancient Oriental Source of Christian Sacred Architecture.” American Journal of Archaeology, vol. 43, no. 4, 1939, pp. 647–668. JSTOR, www.jstor.org/stable/498990. Accessed 6 Jan. 2021
