^Azerbaijan IV, C.E. Bosworth, Encyclopaedia Iranica, December 15, 1987;"...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 (q.v.) took their place as one of the virtually autonomous lines of provincial governors..."
^Clifford Edmund Bosworth, The New Islamic Dynasties: A Chronological and Genealogical Manual, Columbia University, 1996. pg 147: "The Sajids were a line of caliphal governors in north-western Persia, the family of a commander in the 'Abbasid service of Soghdian descent which became culturally Arabised."
^V. Minorsky, Studies in Caucasian history, Cambridge University Press, 1957. pg 111
Madelung, Wilferd. "Minor Dynasties of Northern Iran." The Cambridge History of Iran, Volume 4: The Period From the Arab Invasion to the Saljuqs. Ed. R. N. Frye. New York, New York: Cambridge University Press, 1975.
Clifford Edmund Bosworth, The New Islamic Dynasties: A Chronological and Genealogical Manual, Columbia University, 1996.
V. Minorsky, Studies in Caucasian history, Cambridge University Press, 1957.