CONCEPTShttp://dewey.info/class/361.3092/dewey.infohttp://d-nb.info/gnd/4055680-3d-nb.infohttp://eurovoc.europa.eu/4564eurovoc.europa.euhttp://id.loc.gov/authorities/subjects/sh85124114id.loc.govhttp://lod.gesis.org/thesoz/concept/10044515lod.gesis.org。