C. E. Bosworth, "AZERBAIJAN iv. Islamic History to 1941" in Encyclopaedia Iranica. [1]Arxivləşdirilib 2013-03-11 at the Wayback Machine(accessed November 2010). Quote: "In ca. 279/892 the caliph Moʿtażed appointed one of his generals, Moḥammad b. Abi’l-Sāj, an Iranian from Central Asia, as governor of Azerbaijan and Armenia, and the family of the Sajids"
C. E. Bosworth, "AZERBAIJAN iv. Islamic History to 1941" in Encyclopaedia Iranica. [1]Arxivləşdirilib 2013-03-11 at the Wayback Machine(accessed November 2010). Quote: "In ca. 279/892 the caliph Moʿtażed appointed one of his generals, Moḥammad b. Abi’l-Sāj, an Iranian from Central Asia, as governor of Azerbaijan and Armenia, and the family of the Sajids"
