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WikiPedia: Đế quốc Songhai http://www.africankingdoms.com http://www.umes.edu/cms300uploadedFiles/AJCJS/acja... http://www.wdl.org/en/item/36 http://www.bbc.co.uk/worldservice/africa/features/... https://books.google.com/books?id=FX5UGiFsmbEC&pg=... https://id.loc.gov/authorities/names/n97031423 https://viaf.org/viaf/135042118 https://www.wikidata.org/wiki/Q202687#identifiers https://www.worldcat.org/identities/lccn-n97031423