STEPHANOVICH, Petr Sergeyevich. ‘Feudalism’ and the Boyars of Medieval Russia. Dějiny – teorie – kritika, [S. l.], n. 2, p. 257–273, 2008. DOI: 10.14712/24645370.2499. Disponível em: https://test.scied.cz/dejinyteoriekritika/article/view/2499. Acesso em: 21 may. 2026.