found: His Ying huan kʻao lüeh, 1974?
found: Fang, W. Chʻing Hsü Sung-kʻan hsien sheng Chi-yü nien pʻu, 1982:t.p. (Hsü Sung-kʻan)
found: His Eikan shiryaku, 18--(name not given)
found: Daijiten:v. 3-4, p 593 (under Eikan shiryaku: Jo Keiyo [Chinese reading: Hsü Chi-yü])
found: Hsü Chi-yü chi, 1995:p. 1, 1st group, etc. (b. 1795; t. Chien-nan; native of Tung-yeh chen, Wu-tʻai hsien, Shansi Prov.; 1813 chü jen; 1826 chin shih; d. 7/Tʻung-chih kuei yu 1873 at age 79)
found: OCLC #18758496, January 15, 2023(access point: 徐繼畬, 1795-1873 = Xu, Jiyu, 1795-1873; usage: 徐繼畬 = Xu Jiyu)
found: Bai du bai ke website, January 15, 2023(徐继畬 = Xu Jiyu; December 4, 1795-March 30, 1873; zi [courtesy name] 松龛 = Songkan, 健男 = Jiannan; hao [alias] 牧田 = Mutian; native of Wutai Xian, Shanxi Sheng, China; jin shi 1826; ) - https://baike.baidu.com/item/%E5%BE%90%E7%BB%A7%E7%95%AC
