Darmstadt, Technische Universität. "Eugen Kogon". Technische Universität Darmstadt. Retrieved 18 September 2019.
wikipedia.org
de.wikipedia.org
Eugen Kogon, Der SS-Staat [de]. Das System der deutschen Konzentrationslager (1974) p. 318 (in German)
Eugen Kogon, The Theory and Practice of Hell [de] (1998) p. 265. "... several dozen valuable human beings owe their lives to this closely maintained association ..."
Eugen Kogon, Der SS-Staat [de]. Das System der deutschen Konzentrationslager (1974) p. 338 (in German)
Eugen Kogon, The Theory and Practice of Hell [de] (1998) pp. 285, 286. "The boxes were loaded aboard without incident ... [while] the remaining forty-five men [hid underground] ..."