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HeptarchyTài liệu tham khảo
WikiPedia: Heptarchy http://www.gutenberg.org/files/657/657.txt http://www.ogdoad.force9.co.uk/alfred/alfhidage.ht... https://books.google.com/books?id=O6U5BTD0-rYC&pg=... https://books.google.com/books?id=qndnAAAAMAAJ https://books.google.com/books?id=wqvhYaHrryEC&pg=... https://web.archive.org/web/20170915081950/http://...