Pyŏng-sŏk Son

• Tongsŏ ch'ŏrhak simsin kach'iron kwa hyŏndae sahoe
• Tongsŏ ch'ŏrhak simsin kwan'gyeron ŭi kach'ironjŏk chomyŏng
• Tongsŏ ch'ŏrhak simsin suyangnon