Denis Twitchett et al., "The Cambridge History of China: Volume 5, Sung China, 960–1279 AD"

Denis Twitchett et al., "The Cambridge History of China: Volume 5, Sung China, 960–1279 AD", Box: 8, Folder: 72. Personal papers of John Dardess, PP 635. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/507952 Accessed November 12, 2025.