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Helalia Johannes Hetalia: Axis Powers Helvalı, ArsuzTài liệu tham khảo
WikiPedia: Helalia Johannes http://namibiasport.com.na/node/17689 http://www.iaaf.org/athletes/biographies/letter=0/... http://www.iaaf.org/mm/document/competitions/compe... https://www.sports-reference.com/olympics/athletes... https://web.archive.org/web/20111127192824/http://... https://web.archive.org/web/20120912015348/http://...