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(in English) (27 June 2019) The Eastern Frontier: Limits of Empire in Late Antique and Early Medieval Central Asia, Bloomsbury Publishing, p. 65 ISBN: 978-1-78831-722-1. ""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.""

(in English) (26 January 2011) Central Asia in World History., Oxford University Press, p. 49 ISBN: 0199793174. ""The Türks created the First Central Asian transcontinental empire from Manchuria to the Black Sea.""

(in French) (2 June 2000) ISBN 2213606722 Histoire des Turcs., Fayard ISBN: 2213606722. ""The Turkic Khaganate was a vast khaganate; from Manchuria and the Great Wall of China to the Black Sea.""

(in English) (31 December 1996) History of civilizations of Central Asia: The Crossroads of Civilization: A.D. 250 to 750., UNESCO Publishing ISBN: 978-92-3-103211-0. ""In 569–570, the Turks launched a great military offensive against the Sasanian Empire, and conquered the Hephthalite principalities south of the Oxus belonging to the Sasanian Empire (The Sasanians were powerless to resist because they were also engaged in war against Byzantium). It seems the Turks reached the Kabul–Gandhara area in 570.""

(in English) (26 January 2011) Central Asia in World History., Oxford University Press ISBN: 0199793174. ""Khitans were subjects of Türks.In 916 Khitans former subjects of Türks found an empire""

(in English) (27 June 2019) The Eastern Frontier: Limits of Empire in Late Antique and Early Medieval Central Asia, Bloomsbury Publishing ISBN: 978-1-78831-722-1. ""The people of the Caucasus who had come under under Turkish authority, namely the Abkhāz and Balanjar.""

(in English) The Empire of the Steppes: A History of Central Asia., Rutgers University Press ISBN: 9780813513041. ""In 576 the Göktürks entered Crimea.""

(in English) (2014) Nomads as Agents of Cultural Change: The Mongols and Their Eurasian Predecessors., University of Hawaii Press ISBN: 9780824847890. ""Khitans were subject of Goktürks from 6th century.""

(in English) (31 December 1996) History of civilizations of Central Asia: The Crossroads of Civilization: A.D. 250 to 750., UNESCO Publishing ISBN: 978-92-3-103211-0. ""The taking of the city of Bosporus by the Türk army in the Crimea in these years was also designed to ensure control of the steppe Silk Route up tothe Black Sea.""

(in English) (2005) Historical Development of the Pre-dynastic Khitan, University of Helsinki ISBN: 9789521004988. ""Shiwei submitted to the Türks, under the control of the three Tutuns sent by the Turkic supreme leader, so did the Khitan who were controlled by the Tutun, Pandie, who was sent by the Turkic khaghan.""

(in English) (1996) History of Humanity: From the Seventh Century B.C. to the Seventh Century A.D., UNESCO Publishing ISBN: 9789231028120. ""In 569–570, the Turks launched a great military campaign against the Sasanian Iran, and conquered the Hephthalite principalities south of the Oxus belonging to the Sasanian Empire.""

(in English) (1970) The empire of the steppes : a history of central Asia, Rutgers University Press ISBN: 978-0-8135-1304-1. ""He sent a detachment of T'u-chüeh cavalry against the Byzantine settlements in Crimea ... Likewise, in 581 the T'u-chüeh were under the walls of Chersonesus""

Ktrinko