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WikiPedia: Etika https://catalog.archives.gov/id/10638634 https://id.loc.gov/authorities/subjects/sh85045096 https://d-nb.info/gnd/4015602-3 https://id.ndl.go.jp/auth/ndlna/00569521 https://www.researchgate.net/publication/254440840... https://www.wikidata.org/wiki/Q9465#