^Swietochowski, Tadeusz. Russian Azerbaijan, 1905-1920: The Shaping of a National Identity in a Muslim Community. Cambridge: Cambridge University Press. 2004: 12. ISBN 978-0521522458. (...) and Persian continued to be the official language of the judiciary and the local administration [even after the abolishment of the khanates].
^Pavlovich, Petrushevsky Ilya. Essays on the history of feudal relations in Armenia and Azerbaijan in XVI - the beginning of XIX centuries. LSU them. Zhdanov. 1949: 7. (...) The language of official acts not only in Iran proper and its fully dependant Khanates, but also in those Caucasian khanates that were semi-independent until the time of their accession to the Russian Empire, and even for some time after, was New Persian (Farsi). It played the role of the literary language of class feudal lords as well.
^Gammer, Moshe. Muslim resistance to the tsar. Routledge. 1992: 6. ISBN 0-7146-3431-X. In 1805 the khans of Qarabagh, Shirvan and Sheki swore allegiance to Russia.
^Swietochowski, Tadeusz. Russia and Azerbaijan: A Borderland in Transition. Columbia University Press. 1995: 5. ISBN 0-231-07068-3. The brief and successful Russian campaign of 1812 was concluded with the Treaty of Gulistan, which was signed on October 12 of the following year. The treaty provided for the incorporation into the Russian Empire of vast tracts of Iranian territory, including Daghestan, Georgia with the Sheragel province, Imeretia, Guria, Mingrelia, and Abkhazia, as well as the khanates of Karabagh, Ganja, Sheki, Shirvan, Derbent, Kuba, Baku, and Talysh,
^Potier, Tim. Conflict in Nagorno-Karabakh, Abkhazia and South Ossetia: A Legal Appraisal. Martinus Nijhoff Publishers. 2001: 1: "Panah Ali–Khan founded the Karabakh Khanate in the mid 18th century. To defend it, in the 1750s, he built Panakhabad fortress (subsequently renamed Shusha, after a nearby village) which became the capital of the Khanate. It was not until 1805 that the Russian empire gained control over the Karabakh Khanate, from Persia.". ISBN 90-411-1477-7.