1. Sieberg, A. Handb. Geophys. 4, 109 (1932).
2. Al-Khazraji, al-'uqud al-lululiyyah fi tarikh al-dawlat al-Rasuliyyah, i, 154; ii, 170, 238, 280 (London, 1906, 1907).
3. Theophanis, Patrologia Graeca (ed. Migne, J. P.) 108 (Paris, 1861).
4. Cedrinos, Corp. Script. Hist. Byz. (ed. Bekker, I.) 24 (Bonn, 1838).
5. Michel le Syrien Chronique 11, 22/ii, 507 (Brussels, 1963).