ISSN : 1229-0076
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(2003) Joseonsidae eon’gan jaryoui sogae siltaewa yeongu hyeonhwang:The Present State of Introduction and Research on the Old Vernacular Letters of the Joseon Period:Joseonsidae han’geul seoganui seoyejeok jaejomyeong:A Calligraphical Re-illumination on the Vernacular Letters of the Joseon Period, Seoul: Sejong Hangeul Seoye Keunddeut Moim, Sejong Daewang Ginyeom Saeophoe and Hangeul Hakhoe.
(1998) Juhae suncheon kimssi myo chulto ganchal (Notes on the Letters Excavated from the Tomb of Suncheon Kim-ssi), Seoul: Taehaksa
(19861991) Research on Eon’gan, Geonguk University Press
(2001) Sungmyeonggongjuui han’geul pyeonjicheop:Collection of Vernacular Letters Relating to Princess Sungmyeong, Seoul:Munheongwa Haeseoksa.
(1996) Eoneowa munja:Language and the Writing System, Seoul: Yeoksa Bipyeongsa