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SINGLETON, Brent D. Sources: The Ku Klux Klan: History, Organization, Language, Influence, and Activities of America’s Most Notorious Secret Society. Reference & User Services Quarterly. 2011-08-04, roč. 47, čís. 1, s. 86–86. Dostupné online [cit. 2022-12-15]. ISSN1094-9054. DOI10.5860/rusq.47n1.86.2. (anglicky)