* -{Klee, Ernst. “‘Turning the tap on was no big deal’—The gassing doctors during the Nazi period and afterwards,” in ''Dauchau Review'', vol. 2, 1990.}-
* -{Levi, Primo. ''The Drowned and the Saved'', 1986.}-
* {{Cite book|ref=harv| ref = harv| last = Overy| first = Richard| title = Interrogations: The Nazi Elite in Allied Hands, 1945| url = http://books.google.com/books?id=0COxngEACAAJ| year = 2002| publisher = Penguin Books|isbn=978-0-14-200158-5|pages= 356-357}}
* {{Cite book|ref=harv| ref = harv| title = A New Illustrated History of the Nazis: Rare Photographs of the Third Reich | last = Minerbi| first = Alessandra | year = 2005| publisher = David & Charles |bra | url = http://books.google.com/books?id=TFbfiRCVLTUC&pg=PA168&lpg=PA168&dq=%22extermination+camps%22+%2Bhours&source=web&ots=LDIfGuiKoP&sig=HW2xVgYy0mfZv-7dqaHdhUBel7I&hl=en&sa=X&oi=book_result&resnum=2&ct=result|pages= 168-}}
