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21 - Philby, (J.B.), and Tritton, (A.S.), Najran Inscriptions, JRAS,. ١٩٤٤.

22 - Ryckrnans, (G.), Inscriptions Sud - Arabes, le Museon, XII, ١٩٤٢.

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24 - Ryckrnans, (J.), Aspects Mouuveaux du Problerne Tharnou­deens, Studia Islamica, S, ١٩٥٦.

25 - Smith, (S.), Events in Arabia in the ٦th Century A.O., BSOAS, ١٩٥٤.

26 - Tarn (W.W.), Ptolemy II and Arabia, in JEA, IS, ١٩٢٩.