"Siryong Yŏngŏ munpŏp" = Practical English grammar
MLA
Yun, Ch'i-ho, et al. "Siryong Yŏngŏ munpŏp" = Practical English grammar. Che 2-pʻan. Sŏul-si : Pagijŏng, 2008.
APA
Yun, C., Kim, M., Ha, T., Ko, Y. & Yu, U. (2008). "Siryong Yŏngŏ munpŏp" = Practical English grammar. Che 2-pʻan. Sŏul-si : Pagijŏng, 2008.
Chicago
Yun, Ch'i-ho, Min-su. Kim, Tong-ho. Ha, Yŏng-gŭn. Ko and Ŭng-ho Yu. "Siryong Yŏngŏ munpŏp" = Practical English grammar. Che 2-pʻan. Sŏul-si : Pagijŏng, 2008.