^Haug، Robert (٢٧ی حوزەیرانی ٢٠١٩). The Eastern Frontier: Limits of Empire in Late Antique and Early Medieval Central Asia (بە ئینگلیزی). Bloomsbury Publishing. لاپەڕە ٦٥. ژپنک٩٧٨-١-٧٨٨٣١-٧٢٢-١. The collapse of the Hephthalite domains made neighbours of the Türk Khāqānate and the Sasanian Empire, both sharing a border that ran the length of the River Oxus. Further Turkish expansion to the west and around the Caspian Sea saw them dominate the western steppes and its people and extend this frontier down to the Caucasus where they also shared a border with the Sasanians. Khusrow is noted at the time for improving the fortifications on either side of the Caspian, Bāb al-Abwāb at Derbent and the Great Wall of Gorgān.
^Sinor 1969, پ. 101. sfn error: no target: CITEREFSinor1969 (help)
^Taagepera، Rein (1979). «Size and Duration of Empires: Growth-Decline Curves, 600 B.C. to 600 A.D.». Social Science History. ٣ (3/4): ١٢٩. doi:١٠.٢٣٠٧/١١٧٠٩٥٩. JSTOR١١٧٠٩٥٩.
^Taşağıl، Ahmet (٢٠٢١). Türk Model Devleti Gök Türkler. Bilge Kültür Sanat. ژپنک٩٧٨٦٠٥٩٥٢١٥٩٨.
^West، Barbara A. (١٩ی ئایاری ٢٠١٠). Encyclopedia of the Peoples of Asia and Oceania. Infobase Publishing. لاپەڕە ٨٢٩. ژپنک٩٧٨-١-٤٣٨١-١٩١٣-٧. The first people to use the ethnonym Turk to refer to themselves were the Turuk people of the Gokturk Khanate in the mid sixth-century