View source for 620s

===Sources===
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* {{cite web |last=Bede |author-link=Bede |title=Book II |work=[[Ecclesiastical History of the English People]] |publisher=Internet History Sourcebooks Project |url=http://www.fordham.edu/halsall/basis/bede-book2.html |ref={{harvid|Bede Book&nbsp;II}} |access-date=2021-07-03 |archive-date=2011-05-13 |archive-url=https://web.archive.org/web/20110513234436/http://www.fordham.edu/halsall/basis/bede-book2.html |url-status=dead }}
* {{cite book |last=Christian |first=David |author-link=David Christian (historian) |date=1999 |title=A History of Russia, Mongolia and Central Asia |location=Malden, MA |publisher=Blackwell |isbn=978-0-631-20814-3}}
* <!--Fine 1991-->{{The Early Medieval Balkans}}
* {{cite book |last=Kaegi |first=Walter E. |author-link=Walter Kaegi |date=2003 |title=Heraclius: emperor of Byzantium |publisher=[[Cambridge University Press]] |isbn=0-521-81459-6}}
* {{cite book|title=[[Zizhi Tongjian]] ''(資治通鑑)''|trans-title=Comprehensive Mirror for Aid in Government|last=[[Sima Guang]]|language=zh|year=1086|ref={{harvid|''Zizhi Tongjian''}}}}
{{refend}}

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[[Category:620s| ]]