Железен закон на олигархията (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Железен закон на олигархията" in Bulgarian language version.

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1web.archive.org

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web.archive.org (Global: 1^st place; Bulgarian: 1^st place)

Robert Struble, Jr., Treatise on Twelve Lights, (TeLL, inc., 2005, 2009), Chapter seven, Rotation in Office.