818 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "818" in English language version.

refsWebsite

Global rank English rank

2books.google.com

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3^rd place

books.google.com

Fine, John V. A. Jr. (1991) [1983]. The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century. Ann Arbor: University of Michigan Press. p. 107. ISBN 0-472-08149-7.
Whitney, James Pounder; Gwatkin, Henry Melvill (1922). The Cambridge Medieval History: Maps III. Germany and the Western Empire. 3. Plantagenet Publishing. p. 23.