English: Map of Xu at its greatest extent during the mid 8th century BC.
Dark red: Xu heartland; red: Xu-led Huaiyi confederation; pink: Xu allies or under Xu influence
Shaughnessy, Edward L. (1999) "Western Zhou History" in The Cambridge History of ancient China - From the Origins of Civilization to 221 B.C, Cambridge: Cambridge University Press, p. 324 ISBN: 9780521470308.
Fox Brindley, Erica (2015) Ancient China and the Yue: Perceptions and Identities on the Southern Frontier, c.400 BCE-50 CE, Cambridge: Cambridge University Press, p. 70 ISBN: 978-1-107-08478-0.
Zuo Qiuming: Zuo Zhuan. BOOK V. DUKE XI. - XV. Fifteenth year.
Zuo Qiuming: Zuo Zhuan. BOOK I. DUKE YIN. - II. Second year.
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