Tolong jelaskan mengenai Bacaan tambahan dari Zheng Guanying

Chong, Key Ray. "Cheng Kuan-ying (1841–1920): A Source of Sun Yat-sen's Nationalist Ideology?" The Journal of Asian Studies. Association for Asian Studies, Volume 28, Issue 2. February 1969, pp. 247–267. Published online 1 March 2011. .

Hao, Yen-P'ing. "Cheng Kuan-ying: The Comprador as Reformer." The Journal of Asian Studies. Association for Asian Studies, Vol. 29, No. 1 (Nov., 1969), pp. 15–22. .