https://en.wikipedia.org/wiki/David_Z._T._Yui

https://archives.lib.umn.edu/agents/people/1137

https://www.bu.edu/missiology/missionary-biography/w-x-y-z/yui-david-z-t-yu-jih-chang-yu-rizhang-1882-1936/

https://baike.baidu.com/item/%E9%83%AD%E7%A7%89%E6%96%87/2007711

https://m.thepaper.cn/baijiahao_7435875