《三国志·魏书·少帝纪》
关内侯郑小同，品性温良恭俭，孝亲忠友，遵循礼法不会违背。
关内侯郑小同，温恭孝友，帅礼不忒。
Marquis within the Passes Zheng Xiaotong has a mild and frugal nature, is filial to his parents and loyal to his friends, and follows etiquette without fail.