↑Abbas Amanat. The Pivot of the Universe: Nasir Al-Din Shah Qajar and the Iranian Monarchy, 1831—1896, I. B. Tauris, pp 2—3; «In the 126 years between the fall of the Safavid state in 1722 and the accession of Nasir al-Din Shah, the Qajars evolved from a shepherd-warrior tribe with strongholds in northern Iran into a Persian dynasty.»
↑Choueiri, Youssef M. A companion to the history of the Middle East. — Blackwell Ltd., 2005, pp. 231, 516.