Сергій I (Belarusian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Сергій I" in Belarusian language version.

refsWebsite

Global rank Belarusian rank

2books.google.com

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books.google.com

Frank N Magill, Alison Aves, Dictionary of World Biography (Routledge 1998 ISBN 978-1-57958041-4), vol. 2, pp. 823—825
Wilfried Hartmann, Kenneth Pennington (editors), The History of Byzantine and Eastern Canon Law to 1500 (CUA Press 2012 ISBN 978-0-81321679-9), p. 79