823 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "823" in English language version.

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archive.org

Bury, John Bagnell (1912). A History of the Eastern Roman Empire from the Fall of Irene to the Accession of Basil I (A.D. 802–867). London: Macmillan and Company. pp. 105–106. OCLC 458995052.

books.google.com

Treadgold, Warren (1988). The Byzantine Revival, 780–842. Stanford, California: Stanford University Press. pp. 241–242. ISBN 978-0-8047-1462-4.

britannica.com

"Charles II | Holy Roman emperor". Encyclopedia Britannica. Retrieved November 27, 2020.

worldcat.org

search.worldcat.org

Bury, John Bagnell (1912). A History of the Eastern Roman Empire from the Fall of Irene to the Accession of Basil I (A.D. 802–867). London: Macmillan and Company. pp. 105–106. OCLC 458995052.