Steinhardt, Nancy Riva Shatzman, Imperial Architecture under Mongolian Patronage: Khubilai's Imperial City of Daidu, Harvard University, 1981, p. 222.
«The planning of the Imperial City, along with many other imperial projects of the 1260s, was supervised by Khubilai's close minister Liu Bingzhong. That the Imperial City was Chinese in style was certainly Liu's preference...»