*Wieczynski, Joseph L. ''The Modern Encyclopedia of Russian and Soviet History'' (Volume 21). Academic International Press, 1976, ISBN 0875690645.
*William K. Medlin and Christos G. Patrinelis. ''Renaissance Influences and Religious Reforms in Russia''. Genève: Librairie Droz, 1971, ISBN 2600038949.
*https://en.wikipedia.org/wiki/Maximus_the_Greek* http://www.calendar-ortodox.ro/luna/ianuarie/ianuarie21.htm
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