Yaman, its early mediæval history, by Najm ad-Din 'Omārah al-Ḥakami; also the abridged history sof its dynasties by Ibn Khaldūn, and an account of the Karmathians of Yaman by Abu 'Abd Allah Baha ad-Din al-Janadi; the original texts, with translation and notes by Henry Cassels Kay, M.R.A.S