Sources:
- Howard Crosby Butler: Early Churches in Syria. Fourth to Seventh Centuries. Princeton University Press, Princeton 1929, p.76
- Andrea Zerbini, Society and economy in marginal zones: a study of the Levantine agricultural economy (1st-8th c. AD);2013; file:///C:/Users/user/AppData/Local/Temp/2013ZerbiniAPhD.pdf