Sources:
- Howard Crosby Butler: Early Churches in Syria. Fourth to Seventh Centuries. Princeton University Press, Princeton 1929
- idem eds, Syria: publications of the Princeton University Archaeological Expeditions to Syria in 1904 - 5 and 1909 (Div. 2, Sect. B ; 1) — 1907; https://digi.ub.uni-heidelberg.de/diglit/syria_div2_sectB_1/0029