Han'guk ŭi chŏngch'i kyunyŏl kujo chiyŏk, kyech'ŭng, sedae mit inyŏm = Political cleavages in Korea : region, class, generation and ideology - Yi, Kap-yun; Yi, Hyŏn-u (Tosŏ Ch'ulp'an Orŭm, 2014)