"'보컬선생·안무가' SM그룹 블랙비트 요즘 뭐하나" ['Vocal teacher, choreographer' what's SM group Black Beat doing nowadays?] (in Korean). Star News. 27 July 2011. Retrieved 25 January 2013.
web.archive.org
블랙비트 [Mnet Black Beat Profile] (in Korean). Mnet Music. Archived from the original on 24 December 2013. Retrieved 25 January 2013.