HEYDE, Jürgen. Livonia under the Polish-Lithuanian commonwealth. The struggle for power and the social transformation. Quaestio Rossica, [S. l.], n. 2, p. 112–143, 2014. DOI: 10.15826/qr.2014.2.045. Disponível em: https://qr.urfu.ru/ojs/index.php/qr/article/view/045. Acesso em: 19 apr. 2024.