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* [http://yulgok.co.kr/book/chndo1.htm 天道策] | * [http://yulgok.co.kr/book/chndo1.htm 天道策] | ||
* [http://biz.khan.co.kr/khan_art_view.html?artid=201510260939421&code=920100 Short biography] ([https://private.michaelhan.net/snapshots/philosopher-yiyi-1.pdf PDF], 2019-09-08) | * [http://biz.khan.co.kr/khan_art_view.html?artid=201510260939421&code=920100 Short biography] ([https://private.michaelhan.net/snapshots/philosopher-yiyi-1.pdf PDF], 2019-09-08) | ||
== Languages == | == Languages == | ||