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. (١٩٩٩) "Western Zhou History" in The Cambridge History of ancient China - From the Origins of Civilization to 221 B.C، کامبریدج: Cambridge University Press، p. 324 ISBN: 9780521470308.
Fox Brindley, Erica (٢٠١٥) Ancient China and the Yue: Perceptions and Identities on the Southern Frontier, c.400 BCE-50 CE، کامبریدج: 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.