C. E. Bosworth, "Chorasmia ii. In Islamic times" in: Encyclopaedia Iranica (reference to Turkish scholar Kafesoğlu), v, p. 140, Online Edition: "The governors were often Turkish slave commanders of the Saljuqs; one of them was Anūštigin Ḡaṛčaʾī, whose son Qoṭb-al-Dīn Moḥammad began in 490/1097 what became in effect a hereditary and largely independent line of ḵǰᵛārazmšāhsقالب:Which lang." (LINK)
Negmatov, B. M. "ABOUT THE ARMY OF STATE OF JALOLIDDIN KHOREZMSHAH." CURRENT RESEARCH JOURNAL OF PEDAGOGICS 2, no. 09 (2021): 13-18. p.16. “The Khorezmshahs belonged to the Bekdili clan of the Oguzs. It is natural, therefore, that their black flag bears the seal of this tribe”
