J.A. Langfeldt, "Recently Discovered Early Christian Monuments in Northeastern Arabia", Arabian Archaeology and Epigraphy, 5 (1994), 32–60 [1]Diarsipkan 2017-10-10 di Wayback Machine..
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J.A. Langfeldt, "Recently Discovered Early Christian Monuments in Northeastern Arabia", Arabian Archaeology and Epigraphy, 5 (1994), 32–60 [1]Diarsipkan 2017-10-10 di Wayback Machine..