Homa Katouzian[en]. Iranian history and politics. Routledge, 2003. pg 128: «Indeed, since the formation of the Ghaznavids state in the tenth century until the fall of Qajars at the beginning of the twentieth century, most parts of the Iranian cultural regions were ruled by Turkic-speaking dynasties most of the time. At the same time, the official language was Persian, the court literature was in Persian, and most of the chancellors, ministers, and mandarins were Persian speakers of the highest learning and ability»
Richard Tapper[en]. Shahsevan in Safavid Persia. // Bulletin of the School of Oriental and African Studies, University of London, Vol. 37, No. 3, 1974, p. 324.
