Report (in Korean). February 12, 2020. Oh, Yoon-joo (December 1, 2021). 아이오케이컴퍼니, 7인조 걸그룹 엘리스 영입 "아낌없이 지원할 것 [IOK Company to recruit 7-member girl group
Archived from the original on 2024-09-28. Retrieved 2023-12-29. "박희순, 아이오케이컴퍼니 전속계약 체결…고현정 조인성 한솥밥 [공식]". Newsen. May 4, 2023. Archived from the original