Durot, Eric, Iskra Schwarcz, and Vladimir Shishkin. “Searching for Allies: A Letter from Henry II De Valois to Ivan IV”. Quaestio Rossica 7, no. 3 (September 27, 2019): 871–900. Accessed January 27, 2020. https://qr.urfu.ru/ojs/index.php/qr/article/view/qr.413.