Chonggyogaehyŏk, Yurŏbŭi yŏksarŭl pakkuda: 48kae tosi, 72myŏngŭi kaehyŏkchadŭri irun taebyŏn - Welker, Michael; Beintker, Michael; Lange, Albert de (Taehan Kidokkyo sŏhoe, 2017)