Yang,Hyŏn-bong, Cho, T.-hŭi, Pak, C.-bok, &amp; Sanŏp Yŏnʼguwŏn. (2009). <i>Ch'angŏp kiŏp ŭi haengt'ae mit sŏngkwa punsŏk : Kyŏngyŏngsŏng kwa koyong ch'angch'ul yoin ŭl chungsim ŭro</i>. Sanŏp Yŏnʼguwŏn.