Yo-han Ko

• In'gan hyŏnsang kwa insŏng kyoyuk ŭi hyŏnsanghak
• In'gan kyoyuk ŭi simni ch'ŏrhakchŏk ihae
• Karŭch'im ŭi kyoyuk hyŏnsanghakchŏk ihae
• Naerŏt'ibŭ kiban taehaksaeng insŏng kyoyuk tamnon