References Khagan

sources

fairbank, john king. cambridge history of china . cambridge university press, 1978. web page
grousset, rené. (1970). empire of steppes: history of central asia. translated naomi walford. rutgers university press. new brunswick, new jersey, u.s.a.third paperback printing, 1991. isbn 0-8135-0627-1 (casebound); isbn 0-8135-1304-9 (pbk).
whittow, mark. making of byzantium, 600–1025, university of california press, berkeley, los angeles, 1996.
zhou, weizhou [1985] (2006). history of tuyuhun. guilin: guangxi normal university press. isbn 7-5633-6044-1.