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Murthy, Viren (2006). "Modernity against modernity: Wang Hui's critical history of Chinese thought". Modern Intellectual History. 3 (1). Cambridge Univ Press: 137–165. doi:10.1017/S147924430500065X. S2CID144009226.
"Xi 24". Zuozhuan. Translated by Steven Durrant; Wai-yee Lee; David Schaberg. University of Washington Press. 2016 [c. 300 BCE]. pp. 380–381. ISBN9780295999159. 昔周公弔二叔之不鹹,故封建親戚以蕃屏周。" "Formerly, Duke of Zhou grieved that the two younger brothers (Guan Shu Xian & Cai Shu Du) were not in accord with him. That is why he enfeoffed (封; fēng) and established (建; jiàn) kinsmen and relatives as a hedge and a screen for Zhou