Marcuse, Harold; Niemöller, Martin. "Of Guilt and Hope". University of California at Santa Barbara.
ushmm.org
ushmm.org
"Martin Niemöller: "First they came for the Socialists..."". Holocaust Encyclopedia. United States Holocaust Memorial Museum. Archived from the original on 23 July 2018. Retrieved 25 July 2018. This is a different and older article which contains more complete photographs than the new version.
"Martin Niemöller: "First they came for the Socialists..."". Holocaust Encyclopedia. United States Holocaust Memorial Museum. Retrieved 25 July 2018.
web.archive.org
"Martin Niemöller: "First they came for the Socialists..."". Holocaust Encyclopedia. United States Holocaust Memorial Museum. Archived from the original on 23 July 2018. Retrieved 25 July 2018. This is a different and older article which contains more complete photographs than the new version.