823 (Polish Wikipedia)

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

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1britannica.com

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archive.org

John BagnellJ.B. Bury John BagnellJ.B., 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, 1912, s. 105–106, OCLC 458995052 .

britannica.com

Charles II, [w:] Encyclopædia Britannica [dostęp 2022-09-30] (ang.).

worldcat.org

John BagnellJ.B. Bury John BagnellJ.B., 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, 1912, s. 105–106, OCLC 458995052 .