Kim, Ga-young (9 January 2015). "중년은 멋있다 (길용우, 독고영재)" [Middle-aged is cool (Kil Yong-woo, Dokgo Young-jae)]. Chosun Pub (in Korean). Archived from the original on 2015-02-18. Retrieved 2015-02-18.
Kim, Ga-young (9 January 2015). "중년은 멋있다 (길용우, 독고영재)" [Middle-aged is cool (Kil Yong-woo, Dokgo Young-jae)]. Chosun Pub (in Korean). Archived from the original on 2015-02-18. Retrieved 2015-02-18.