A. Titsian, “Moscow Parishes in the End of the 19th - Beginning of the 20th Centuries: Share of Believers Participating in Sacraments of Confession and Communion Among Urban Orthodox Citizens”, State, Religion and Church, vol. 36, no. 2, pp. 315–342, Mar. 2018, doi: 10.22394/2073-7203-2018-36-2-315-342.