en.wikipedia.org
en.wikipedia.org
britannica.com
weimarer-republik.net
alphahistory.com
library.fiveable.me
dbpedia.org
DBpedia Association
https://dbpedia.org › page › Independent_Social_Democratic_Party_of_Germany
ghdi.ghi-dc.org
German History in Documents and Images
https://ghdi.ghi-dc.org › sub_document.cfm?document_id=4628
wiki-gateway.eudic.net
wiki-gateway.eudic.net
https://wiki-gateway.eudic.net › wikipedia_en › USPD.html
jstor.org
academia-lab.com
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