Klyuchevskiy V.O. Boyarskaya duma drevney Rusi. Pb.,  1919. /Klyuchevsky V.O. Boyarskaya duma of ancient Russia. Pb.,  1919. - landofmagazines.com

TransliterationKlyuchevskiy V.O. Boyarskaya duma drevney Rusi. Pb., 1919.

In EnglishKlyuchevsky V.O. Boyarskaya duma of ancient Russia. Pb., 1919.

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