Map of the historical region of (Iranian) Azerbaijan

https://commons.wikimedia.org/w/index.php?title=File:Iranian-Azerbaijan.png&dir=prev#filehistory

Based on the sources;

• Adurbadagan during the late Sasanian period: A study in administrative geography by Mehrdad Ghodrat-Dizaji
• Northern Territories of the Sasanian Atropatene and the Arab Azerbaijan by Arsen Shahinyan
• The Iranian Expanse by Canepa
• Cambridge History of Iran vol 3 part 1 and 2
• A Reinterpretation of the Sasanian Relief at Salmas by Ehsan Shavarebi
• Ibn Khurradadhbih, Abu al-Qasim 'Abd Allah. Kitab al-Masalik wa'l-Mamalik. Ed and trans. M.J. de Goeje. Leiden: E.J. Brill, 1889.
• Le Strange, Guy. The Lands of the Eastern Caliphate: Mesopotamia, Persia, and Central Asia, from the Moslem conquest to the time of Timur. Cambridge: Cambridge University Press, 1905.
• Bosworth, C.E. "Zand̲j̲ān." The Encyclopaedia of Islam, New Edition, Volume XI: W–Z. Leiden: E. J. Brill, 2002 pp. 446–447.
• Minorsky, M. "Adharbaydjan." The Encyclopaedia of Islam, Vol I. New Edition. Leiden: E.J. Brill, 1960. ISBN 90-04-08114-3.
• Al-Tabari, Abu Ja'far Muhammad ibn Jarir. The History of al-Tabari. Ed. Ehsan Yar-Shater. 40 vols. Albany, NY: State University of New York Press, 1985-2007.