Korean overseas information service (2003). Handbook of Korea (11. ed.). Seoul: Korean Overseas Information Service. p. 568. ISBN9788973750054. Retrieved 3 March 2016.
Confucianism, a habit of the heart. Philip J. Ivanhoe, Sungmoon Kim. Albany. 2016. p. 4. ISBN978-1-4384-6014-7. OCLC936547932.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)