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Books about Guicong:
Lun Zhongguo jing ji gai ge: Dao lu, zhuan gui, jie gui--cong shi jie jing ji kan Zhongguo (Mandarin Chinese Edition... by Chen Xiao (1996)
Wiki information Guicong:
Cui Guicong, courtesy name Xuangao, was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reign of Emperor Xuānzong.