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  1. Hanʼgukchŏk sago ŭi wŏnhyŏng: kŭ wŏnchʻŏn kwa hŭrŭm.Hong-U. Yi (ed.) - 1988 - Sŏul: Koryŏwŏn.
     
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    Sŏngnihak ŭi kyoyuk iron.Hong-U. Yi - 2000 - Sŏul Tʻŭkpyŏlsi: Sŏnggyŏngjae.
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