1. Agajanov, S. G. (1969). Очерки истории огузов и туркмен Средней Азии IX-XIII вв. Ашгабад: Ылым.
2. Agajanov, S. G. (1998). The states of the Oghuz, the Kimek and the Kïpchak. In History of Civilizations of Central Asia IV/1 (The Age of Achievement: A.D. 750 to the End of the Fifteenth Century, the Historical, Social and Economic Setting). (pp. 61-76). Paris: UNESCO.
3. Al-Qāḍī, Wadād. (1988). The Term “Khalīfa” in Early Exegetical Literature. Die Welt des Islams, New Series, 28(1/4), 392-411.
4. Angeli, F. (2007). Очерки истории гагаузов потомков огузов (середина VIII - начало XXI вв.). Кишинев: Tipogr. Centrala.
5. Banguoğlu, T. (1959). Kâşgari’den Notlar: II – Oğuzlar ve Oğuzeli Üzerine. Türk Dili Araştırmaları Yıllığı Belleten, 7, 1-26.