Zirogiannis, Marc (December 2017). "In Memoriam-Dr. Un-Yong kim". No. December 2017. Tae Kwon Do Life Magazine. Archived from the original on 28 April 2021. Retrieved 3 October 2019.
Zirogiannis, Marc (December 2017). "In Memoriam-Dr. Un-Yong kim". No. December 2017. Tae Kwon Do Life Magazine. Archived from the original on 28 April 2021. Retrieved 3 October 2019.