M. Karpińska, “The Story of a Turbulent Friendship. Karol Sienkiewicz and Piotr Kopczyński: Schoolmates at the Krzemieniec Lyceum: Friends – Neighbours – Political Opponents”, in Relacje – więzi – parantele, vol. 14, J. Kita and M. Korybut-Marciniak, Eds. Poland: Lodz University Press, 2026, pp. 295–308. doi: 10.18778/8445-168-7.17.