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Maharaja di negeri sendiri, raja di negeri orang

Senarai penerima ufti dari China

Kang, David C. (2010). East Asia Before the West: Five Centuries of Trade and Tribute. New York : Columbia University Press. /; OCLC 562768984

Shelach, Gideon (1999). [https://books.google.com/books?id=n_-8NnuSwC8C Leadership Strategies, Economic Activity, and Interregional Interaction]: Social Complexity in Northeast China. Springer. ,

von Falkenhausen, Lothar. "The Waning of the Bronze Age: Material Culture and Social Developments, 770–481 B.C." In Michael Loewe and Edward L. Shaughnessy (editors), The Cambridge History of Ancient China: From the Origins of Civilization to 221 B.C.'', pp. 450–544. Cambridge, England: Cambridge University Press. /.