Kowalska-Leder, J. 2013. Helping Those Doomed to Annihilation as a Source of Destruction – On the Basis of Brandla Siekierkowa’s Personal Documents. Zagłada Żydów. Studia i Materiały. Holocaust Studies and Materials (luty 2013), 159-1711. DOI:https://doi.org/10.32927/zzsim.801.