Selin, Adrian. “A Conference on Social Stratification in Russia Between the 16th and 20th Centuries: European Context”. Quaestio Rossica 5, no. 4 (December 23, 2017): 1199–1207. Accessed July 24, 2021. https://qr.urfu.ru/ojs/index.php/qr/article/view/275.