Coba jelasin Lihat pula dari H.H. Kung dong

Barnouin, Barbara and Yu Changgen. Zhou Enlai: A Political Life.  Hong Kong: Chinese University of Hong Kong, 2006. ISBN 962-996-280-2. Retrieved March 12, 2011.

Gillin, Donald G. Warlord: Yen Hsi-shan in Shansi Province 1911-1949. Princeton, New Jersey: Princeton University Press. 1967.