Choi Na-young (July 29, 2015). "여자친구 "파워청순? 우린 '엽사' 많은 그룹"[인터뷰]" (in Korean). OSEN. Naver News. Archived from the original on April 10, 2021. Retrieved May 26, 2016.
"GFriend". After School Club. Episode 199. February 16, 2016. Event occurs at 15:58. Arirang. Archived from the original on September 18, 2019. Retrieved May 25, 2016.
Choi Na-young (July 29, 2015). "여자친구 "파워청순? 우린 '엽사' 많은 그룹"[인터뷰]" (in Korean). OSEN. Naver News. Archived from the original on April 10, 2021. Retrieved May 26, 2016.
"GFriend". After School Club. Episode 199. February 16, 2016. Event occurs at 15:58. Arirang. Archived from the original on September 18, 2019. Retrieved May 25, 2016.