Lee, Sang-jin (December 27, 2020). 태연 'What Do I Call You', '인기가요'서 1위! [Taeyeon ranked 1st in 'What Do I Call You' and 'Inkigayo']. Asia News Agency (in Korean). Archived from the original on December 27, 2020. Retrieved December 27, 2020.
Ji, Min-kyung (December 3, 2020). 태연, 15일 네 번째 미니앨범 'What Do I Call You' 발매 [공식] [Taeyeon releases 4th mini album 'What Do I Call You' on the 15th [Official]]. Osen (in Korean). Retrieved December 3, 2020 – via Naver.
Hwang, Hye-jin (November 20, 2020). SM 측 “태연 12월 컴백 준비 중, 많은 기대 부탁”(공식) [SM's "Taeyeon is preparing for a comeback in December, please look forward to it" (Official)]. Newsen (in Korean). Archived from the original on November 20, 2020. Retrieved December 3, 2020 – via Naver.
Park, Panseok (November 30, 2020). 태연, 수줍은 새 앨범 예고 "저 곧 앨범 나와요" [★SHOT!] [Taeyeon, shy new album notice "I'm coming out soon" [★SHOT!]]. Osen (in Korean). Archived from the original on December 25, 2020. Retrieved December 3, 2020 – via Naver.
Kim, Miji (December 3, 2020). "'믿듣탱' 온다"…태연, 12월 15일 미니앨범으로 컴백 확정[공식입장]" ["It's coming"... Taeyeon confirmed comeback with mini album on December 15th [Official Admission]]. Xports News (in Korean). Retrieved December 3, 2020 – via Naver.
Kim, Ye-na (November 20, 2020). "[단독] 태연, 12월 솔로 컴백 확정…'믿듣탱' 열일 행보" [[Exclusive] Taeyeon, December solo comeback confirmed... 'Believe it']. Xports News (in Korean). Archived from the original on November 20, 2020. Retrieved December 3, 2020 – via Naver.
Jeon Hyo-jin (December 16, 2020). "[DA:차트] 태연 1위, 아이튠즈 톱 앨범 18개 지역 정상" [[DA:Chart] Taeyeon's 1st place, top 18 iTunes top albums]. Sports Donga (in Korean). Archived from the original on January 26, 2021. Retrieved January 29, 2021.
Jeon, Hyo-jin (December 3, 2020). 태연, 15일 컴백…'What Do I Call You' 발매 [공식] [Taeyeon, comeback on the 15th... Release of 'What Do I Call You' [Official]]. Sports DongA (in Korean). Archived from the original on December 3, 2020. Retrieved December 3, 2020 – via Naver.
"What Do I Call You" (in Chinese). China QQ. Archived from the original on December 25, 2020. Retrieved July 18, 2021.
sbs.co.kr
programs.sbs.co.kr
"12월 마지막 주 인기가요 차트" [Popular song chart for the last week of December]. SBS (in Korean). December 27, 2020. Archived from the original on December 27, 2020. Retrieved December 27, 2020.
Hwang, Hye-jin (November 20, 2020). SM 측 “태연 12월 컴백 준비 중, 많은 기대 부탁”(공식) [SM's "Taeyeon is preparing for a comeback in December, please look forward to it" (Official)]. Newsen (in Korean). Archived from the original on November 20, 2020. Retrieved December 3, 2020 – via Naver.
Park, Panseok (November 30, 2020). 태연, 수줍은 새 앨범 예고 "저 곧 앨범 나와요" [★SHOT!] [Taeyeon, shy new album notice "I'm coming out soon" [★SHOT!]]. Osen (in Korean). Archived from the original on December 25, 2020. Retrieved December 3, 2020 – via Naver.
Jeon, Hyo-jin (December 3, 2020). 태연, 15일 컴백…'What Do I Call You' 발매 [공식] [Taeyeon, comeback on the 15th... Release of 'What Do I Call You' [Official]]. Sports DongA (in Korean). Archived from the original on December 3, 2020. Retrieved December 3, 2020 – via Naver.
Kim, Ye-na (November 20, 2020). "[단독] 태연, 12월 솔로 컴백 확정…'믿듣탱' 열일 행보" [[Exclusive] Taeyeon, December solo comeback confirmed... 'Believe it']. Xports News (in Korean). Archived from the original on November 20, 2020. Retrieved December 3, 2020 – via Naver.
Jeon Hyo-jin (December 16, 2020). "[DA:차트] 태연 1위, 아이튠즈 톱 앨범 18개 지역 정상" [[DA:Chart] Taeyeon's 1st place, top 18 iTunes top albums]. Sports Donga (in Korean). Archived from the original on January 26, 2021. Retrieved January 29, 2021.
"What Do I Call You" (in Chinese). China QQ. Archived from the original on December 25, 2020. Retrieved July 18, 2021.
Physical sales of What Do I Call You:
"2020년 12주차 Album Chart". Gaon Music Chart (in Korean). Archived from the original on January 7, 2021. Retrieved January 7, 2021.
Lee, Sang-jin (December 27, 2020). 태연 'What Do I Call You', '인기가요'서 1위! [Taeyeon ranked 1st in 'What Do I Call You' and 'Inkigayo']. Asia News Agency (in Korean). Archived from the original on December 27, 2020. Retrieved December 27, 2020.
"12월 마지막 주 인기가요 차트" [Popular song chart for the last week of December]. SBS (in Korean). December 27, 2020. Archived from the original on December 27, 2020. Retrieved December 27, 2020.