Tolong jelaskan mengenai Nota dari Khagan dalam bahasa melayu

Fairbank, John King. The Cambridge History of China . Cambridge University Press, 1978.  web page

Grousset, René. (1970). The Empire of the Steppes: a History of Central Asia. Translated by 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. The Making of Byzantium, 600–1025, University of California Press, Berkeley, Los Angeles, 1996.

Zhou, Weizhou [1985] (2006). A History of Tuyuhun. Guilin: Guangxi Normal University Press. ISBN 7-5633-6044-1.