Ji-young, Hwang (October 28, 2020). 서은광·이민혁·이창섭·프니엘, 유닛 비투비 포유 결성 [Seo Eun-kwang, Lee Min-hyuk, Lee Chang-seop, Peniel, formed the unit BtoB]. isplus.live.joins.com (in Korean). Retrieved November 7, 2020.
Hwang Hye-jin (November 3, 2022). "비투비 이창섭, 대학교 예능 출연…고동완 PD와 호흡[공식]" [BTOB's Lee Chang-seop to appear on a university variety show... Breathing with PD Ko Dong-wan [Official]] (in Korean). Newsen. Retrieved November 3, 2022 – via Naver.
Yoo Jeong-min (December 9, 2022). "비투비 서은광·이창섭, '인싸오빠'서 완벽 케미 발산" [BTOB Seo Eun-kwang and Lee Chang-seop show off perfect chemistry in 'Insa Oppa] (in Korean). iMBC. Retrieved December 9, 2022 – via Naver.
Kim, Soo-young (November 9, 2023). "[단독] 비투비 이창섭, 뮤지컬 '겨울나그네' 출연…배우 행보 박차" [[Exclusive] BTOB's Lee Changsub to star in musical 'Winter Wonderland'...spurs acting career]. Korea Economic Daily (in Korean). Retrieved November 9, 2023 – via Naver.
Ko Seungah (November 16, 2020). [N현장] "7인 완전체 기다리며"…비투비 포유, 군백기 채운 유닛 데뷔(종합) [[N-site] "Waiting for all 7 people"... B2B U, debuts a unit filled with military flags (comprehensive)]. News1.
週間 CDシングルランキング 2017年06月06日~2017年06月11日 [CD single weekly ranking from June 5, 2017 to June 11, 2017] (in Japanese). Oricon. Archived from the original on June 14, 2017. Retrieved June 15, 2017.
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Kang Seon-ae (November 23, 2023). "큐브 떠난 비투비 이창섭, 판타지오와 전속계약…"그룹 활동 우선"" [BTOB Lee Chang-seop, who left Cube, signed an exclusive contract with Fantagio... “Group activities take precedence”]. SBS News (in Korean).
週間 CDシングルランキング 2017年06月06日~2017年06月11日 [CD single weekly ranking from June 5, 2017 to June 11, 2017] (in Japanese). Oricon. Archived from the original on June 14, 2017. Retrieved June 15, 2017.
Lee Jung-beom (June 15, 2023). "비투비 이창섭, 새 웹예능 '롯리나잇' MC 발탁…기대감UP" [BTOB Lee Changsub selected as MC for new web entertainment 'Lotri Night'... I'm looking forward to it UP] (in Korean). Xsport News. Retrieved June 16, 2023.