蔡謙.

Zhongguo ge tong shang kou an dui ge guo jin chu kou mao yi tong ji, Minguo 8 nian, 16 nian zhi 20 nian / Cai Qian, Zheng Youkui = Statistics of foreign trade of different Chinese ports with various countries, 1919, 1927-1931 / Jian Zai and Youkwei Zheng.

中國各通商口岸對各國進出口貿易統計, 民國八年, 十六年至二十年 / 蔡謙, 鄭友揆 = Statistics of foreign trade of different Chinese ports with various countries, 1919, 1927-1931 / Jian Zai and Youkwei Zheng.

Shanghai : Shang wu yin shu guan, Minguo 25 [1936]

上海 : 商務印書館, 民國25 [1936]

Guo li zhong yang yan jiu yuan she hui ke xue yan jiu suo cong kan ; di 5 zhong = Institute of Social Sciences, Academia Sinica studies and reports ; no. V

國立中央研究院社會科學研究所叢刊 ; 第5種 = Institute of Social Sciences, Academia Sinica studies and reports ; no. V

鄭友揆, 1909-