APA

Sung K. I., . (1971). Selected Works. Pyongyang: Foreign Languages Publishing House.

Chicago

Sung Kim IL, . 1971. Selected Works. Pyongyang: Foreign Languages Publishing House.

Harvard

Sung K. I., . (1971). Selected Works. Pyongyang: Foreign Languages Publishing House.

MLA

Sung Kim IL, . Selected Works. Pyongyang: Foreign Languages Publishing House. 1971.