Books by Nae-wŏn O
Nongch'on chiyŏk sahoejŏk kiŏp
Nongch'on chiyŏk sahoejŏk kiŏp ŭi saŏp model
Nongch'on chiyŏk hwalsŏnghwa w
Nongch'on chiyŏk hwalsŏnghwa wa ilchari ch'angch'ul ŭl wihan sahoejŏk kiŏp yuksŏng pangan yŏn'gu
Nongch'on chiyŏk sahoejŏk kiŏp
Nongch'on chiyŏk sahoejŏk kiŏp ŭi sŏngkwa p'yŏngka wa chiwŏn pangan
Chunggan maŭl ŭi sahoe kyŏngje
Chunggan maŭl ŭi sahoe kyŏngje kujo
Pʻyŏngya maŭl ŭi sahoe kyŏngje
Pʻyŏngya maŭl ŭi sahoe kyŏngje kujo