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"Heaven". February 25, 2012. Archived from the original on April 2, 2016. Retrieved November 11, 2018.
"2012년 Download Chart" [2012 Download Chart]. Gaon Music Chart. Archived from the original on July 27, 2017. Retrieved September 2, 2018.
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"2013년 Download Chart" [2013 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 3, 2016. Retrieved September 2, 2018.
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"2016년 상반기 결산 Download Chart" [First half of 2016 Download Chart]. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 15, 2016. Retrieved November 12, 2018.
Cumulative sales of "If You" as of January 2017:
"2016 Download Chart". Gaon Music Chart (in Korean). Archived from the original on March 6, 2019. Retrieved September 7, 2018.
"2017년 09주차 Download Chart" [Week 9 of 2017 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 12, 2017. Retrieved November 11, 2018.
"2013년 09월 Download Chart" [September 2013 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on April 2, 2019. Retrieved November 11, 2018.
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"The Guys Are Coming". October 15, 2011. Archived from the original on September 16, 2020. Retrieved November 11, 2018.
"2011년 Download Chart" [2011 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2012년 Download Chart" [2012 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
Cumulative sales for "I Forgot You":
"2012년 12월 Download Chart" [December 2012 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on June 11, 2019. Retrieved November 11, 2018.
"2014년 02월 Download Chart" [February 2014 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 3, 2016. Retrieved November 11, 2018.
"2013년 Download Chart" [2013 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2014년 Download Chart" [2014 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2015년 Download Chart" [2015 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
Park Seung-hyun (December 30, 2022). "환혼' 이재욱♥고윤정 설렘 로맨스 담은 새 OST 발매…에일리 'I'm Sorry' 공개" [Hwanjoon’ Lee Jae-wook ♥ Go Yoon-jung released a new OST with thrilling romance… Ailee’s ‘I’m Sorry’ released] (in Korean). AtStyle. Retrieved December 30, 2022 – via Naver.
oricon.co.jp
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Aileeのリリース一覧 [A Look at Ailee's Releases]. Oricon. Archived from the original on February 10, 2021. Retrieved November 12, 2013.
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"Gaon′s 관찰노트 – 1억 스트리밍 / 250만 다운로드" [Gaon's Observation Notes - 100 Million Streaming / 2.5 Million Downloads]. Gaon Music Chart. September 12, 2018. Archived from the original on September 12, 2018. Retrieved September 12, 2018.
"2013년 Download Chart" [2013 April Download Chart]. Gaon Music Chart (in Korean). Archived from the original on February 10, 2021. Retrieved August 17, 2020.
"2013년 Download Chart" [2013 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 3, 2016. Retrieved September 2, 2018.
"2014년 Download Chart" [2014 Download Chart]. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2013년 Download Chart" [2013 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2014 Download Chart". Gaon Music Chart (in Korean). Archived from the original on May 21, 2015. Retrieved September 2, 2018.
"2015년 Download Chart (국내)" [2015 Download Chart (Domestic)]. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 16, 2016. Retrieved November 11, 2018.
"2015년 Download Chart" [2015 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2016년 상반기 결산 Download Chart" [First half of 2016 Download Chart]. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 15, 2016. Retrieved November 12, 2018.
Cumulative sales of "If You" as of January 2017:
"2016 Download Chart". Gaon Music Chart (in Korean). Archived from the original on March 6, 2019. Retrieved September 7, 2018.
"2017년 09주차 Download Chart" [Week 9 of 2017 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 12, 2017. Retrieved November 11, 2018.
"Solo Christmas". Billboard Korea (in Korean). January 1, 2022. Archived from the original on December 29, 2021. Retrieved December 29, 2021.
"2013년 09월 Download Chart" [September 2013 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on April 2, 2019. Retrieved November 11, 2018.
"2014년 Download Chart" [2014 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"The Guys Are Coming". October 15, 2011. Archived from the original on September 16, 2020. Retrieved November 11, 2018.
"2011년 Download Chart" [2011 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2012년 Download Chart" [2012 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
Cumulative sales for "I Forgot You":
"2012년 12월 Download Chart" [December 2012 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on June 11, 2019. Retrieved November 11, 2018.
"2014년 02월 Download Chart" [February 2014 Download Chart]. Gaon Music Chart (in Korean). Archived from the original on March 3, 2016. Retrieved November 11, 2018.
"2013년 Download Chart" [2013 Download Chart]. Gaon Music Chart (in Korean). p. 2. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2014년 Download Chart" [2014 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.
"2015년 Download Chart" [2015 Download Chart]. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 15, 2016. Retrieved November 11, 2018.