RÜSS, Hartmut. A Modern Study of King Frederick II of Prussia and Russia. Quaestio Rossica, [S. l.], v. 8, n. 4, p. 1461–1471, 2020. DOI: 10.15826/qr.2020.4.539. Disponível em: https://qr.urfu.ru/ojs/index.php/qr/article/view/qr.539. Acesso em: 6 dec. 2023.