Kugŏ sa yŏnʼgu /
Kim Hyŏng-gyu chŏ.
國語史研究
APA Citation
Kim, H., 金亨奎， 1911-. (1964). Kugŏ sa yŏnʼgu. Chŭngbo 3pʻan. [Seoul]: Ilchogak.
MLA Citation
Kim, Hyŏng-gyu, 1911-, and 金亨奎， 1911-. Kugŏ Sa Yŏnʼgu. Chŭngbo 3pʻan. [Seoul]: Ilchogak, 1964.
Warning: These citations may not always be complete (especially for serials).