Diemantaitė Vita. “Activities of the Grand Duchy of Lithuania Chancellery under the Management of Leon Sapieha (1585–1623)”. Lietuvos istorijos studijos 450 (July 21, 2020): 47-60. Accessed July 31, 2021. https://www.journals.vu.lt/lietuvos-istorijos-studijos/article/view/18868.