"Shouting and screaming of the victims could be heard through the opening and it was clear that they fought for their lives"
~Johann Kremer, SS doctor (prescriber)
Piper, Franciszek (1994). "Gas Chambers and Crematoria". In Gutman, Yisrael; Berenbaum, Michael (eds.). Anatomy of the Auschwitz Death Camp. Bloomington: Indiana University Press. pp. 157–182. ISBN 0-253-32684-2.
