1.
ŁABĘDŹ, Piotr. The conflict between Zygmunt III and Krzysztof Radziwiłł and a military activity in Livonia (Inflanty). Klio. CPDPiP. Online. 1 March 2012. Vol. 20, no. 1, pp. 111-140. [Accessed 2 July 2025]. DOI 10.12775/KLIO.2012.004.