Joseph Halperin, “HaDerech Lecherut” (The Way to Freedom) – https://jewsofostrowiec.com/the-way-to-freedom/
Pamięć Treblinki – Fundacja Ochrony Pamięci Obozu Zagłady w Treblince
Joseph Halperin, “HaDerech Lecherut” (The Way to Freedom) – https://jewsofostrowiec.com/the-way-to-freedom/