"Monster". July 7–13, 2020. Archived from the original on July 11, 2020. Retrieved November 25, 2021.
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Park, Se-yeon (April 14, 2025). 레드벨벳 아이린&슬기, 6월 데뷔 첫 아시아 투어 개최 [Red Velvet's Irene & Seulgi will hold their first Asian tour in June]. Ilgan Sports (in Korean). Archived from the original on April 14, 2025. Retrieved April 14, 2025.
"Monster". Billboard. Archived from the original on August 8, 2020. Retrieved July 14, 2020.
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"Monster". Billboard. Archived from the original on August 8, 2020. Retrieved July 14, 2020.
"Monster" (in Korean). July 5–11, 2020. Archived from the original on November 6, 2020. Retrieved November 22, 2020.
"Circle Chart" 2020년 30주차 Download Chart [2020, Week 30 Download Chart] (in Korean). Gaon Music Chart. July 19–25, 2020. Archived from the original on January 13, 2021. Retrieved November 24, 2021.
Peak chart positions from Circle Download Chart:
B-side songs from Monster: "Circle Chart" 2020년 28주차 Download Chart [2020, Week 28 Download Chart] (in Korean). Gaon Music Chart. July 5–11, 2020. Archived from the original on January 13, 2021. Retrieved November 24, 2021.
Park, Se-yeon (April 14, 2025). 레드벨벳 아이린&슬기, 6월 데뷔 첫 아시아 투어 개최 [Red Velvet's Irene & Seulgi will hold their first Asian tour in June]. Ilgan Sports (in Korean). Archived from the original on April 14, 2025. Retrieved April 14, 2025.
Go, Seung-a (May 7, 2025). 레드벨벳-아이린&슬기 온다...26일 미니 2집 '틸트' 발매 [Red Velvet - Irene & Seulgi are coming... 2nd mini album 'Tilt' to be released on the 26th] (in Korean). News1 [ko]. Archived from the original on May 7, 2025. Retrieved May 7, 2025 – via Naver.
Go, Seung-a (May 7, 2025). 레드벨벳-아이린&슬기 온다...26일 미니 2집 '틸트' 발매 [Red Velvet - Irene & Seulgi are coming... 2nd mini album 'Tilt' to be released on the 26th] (in Korean). News1 [ko]. Archived from the original on May 7, 2025. Retrieved May 7, 2025 – via Naver.
"Monster". Gaon Music Chart (in Korean). Archived from the original on October 2, 2020. Retrieved November 22, 2020.
"Monster". Billboard. July 12–18, 2020. Archived from the original on July 14, 2020. Retrieved July 14, 2020.
"Circle Chart" 2020년 30주차 Download Chart [2020, Week 30 Download Chart] (in Korean). Gaon Music Chart. July 19–25, 2020. Archived from the original on January 13, 2021. Retrieved November 24, 2021.
Peak chart positions from Circle Download Chart:
B-side songs from Monster: "Circle Chart" 2020년 28주차 Download Chart [2020, Week 28 Download Chart] (in Korean). Gaon Music Chart. July 5–11, 2020. Archived from the original on January 13, 2021. Retrieved November 24, 2021.
제35회 골든디스크어워즈 with 큐라프록스 후보자 [35th Golden Disc Awards with Curaprox Candidates]. Golden Disk Awards (in Korean). Archived from the original on January 3, 2021. Retrieved August 3, 2022.
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Go, Seung-a (May 7, 2025). 레드벨벳-아이린&슬기 온다...26일 미니 2집 '틸트' 발매 [Red Velvet - Irene & Seulgi are coming... 2nd mini album 'Tilt' to be released on the 26th] (in Korean). News1 [ko]. Archived from the original on May 7, 2025. Retrieved May 7, 2025 – via Naver.