„Chronicles of Terror”. Base of testimonies of the Witold Pilecki Institute of Solidarity and Valor

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Archive of the Pilecki Institute, Chronicles of Terror, Stefan Siekierzyński, Testimony from court/criminal proceedings from 30.01.1969, https://chroniclesofterror.pl/dlibra/show-content?id=8950 [access: 03.07.2026], original: Institute of National Remembrance, 8/4.

Institute of National Remembrance, 8/4, $citation.Title, accessible: Archive of the Pilecki Institute, Chronicles of Terror.