1. Chengde fu zhi 承德府志. Hai Zhong 海忠 and Lin Congjiong 林從烱 (comp.). Taipei: Taipei Chengwen chubanshe, 1968.
2. Goreyo-sa 高麗史. Jeong Inji [鄭麟趾] et al. (comp.). 2006. Reprinted in Gugyeok Goryeosa: Yeoljeon 국역 고려사: 열전 (Korean Translation of the History of Goryeo: Yeoljeon). Seoul: Kyeong-in Munhwasa, 2006. Available via https://terms.naver.com/list.nhn?cid=49617&categoryId=49617 (accessed 3 February 2020).
3. Gengshen di waishi wenjian lu 庚申帝外史聞見錄. Quan Heng 權衡 (author). Available via https://ctext.org/wiki.pl?if=gb&chapter=65846 (accessed 23 January 2020).