Lee, Eun-jung (December 26, 2012). 포미닛 가윤·지윤, '쌍윤' 결성..1월 신보. Yonhap (dalam bahasa Korean). Dicapai pada January 30, 2014.CS1 maint: unrecognized language (link), translated to English at "Ssangyoon Sub-Unit to Debut in January". 4-minutes Forum. December 24, 2012. Diarkibkan daripada yang asal pada 2013-01-10. Dicapai pada February 25, 2013.
Lee (이), MinJee (민지) (January 17, 2013). 투윤 ‘24/7’ 본격 활동 시작, 오늘(17일) 컴백무대 게스트는? [2YOON '24/7' definite activity start, today's (17th) comeback stage guest is?] (dalam bahasa Korean). Newsen. Dicapai pada January 30, 2014.CS1 maint: unrecognized language (link)
newsis.com
Lee (이), JaeHoon (재훈) (Januari 17, 2013). "허가윤·전지윤 '투윤' 떴어요 Harvest Moon" [Heo GaYoon Jeon JiYoon '2YOON' is popular Harvest Moon] (dalam bahasa Korean). NEWSIS.COM. Diarkibkan daripada yang asal pada Februari 1, 2014. Dicapai pada Januari 30, 2014.CS1 maint: unrecognized language (link)
Lee, Eun-jung (December 26, 2012). 포미닛 가윤·지윤, '쌍윤' 결성..1월 신보. Yonhap (dalam bahasa Korean). Dicapai pada January 30, 2014.CS1 maint: unrecognized language (link), translated to English at "Ssangyoon Sub-Unit to Debut in January". 4-minutes Forum. December 24, 2012. Diarkibkan daripada yang asal pada 2013-01-10. Dicapai pada February 25, 2013.
Lee (이), JaeHoon (재훈) (Januari 17, 2013). "허가윤·전지윤 '투윤' 떴어요 Harvest Moon" [Heo GaYoon Jeon JiYoon '2YOON' is popular Harvest Moon] (dalam bahasa Korean). NEWSIS.COM. Diarkibkan daripada yang asal pada Februari 1, 2014. Dicapai pada Januari 30, 2014.CS1 maint: unrecognized language (link)
Lee, Eun-jung (December 26, 2012). 포미닛 가윤·지윤, '쌍윤' 결성..1월 신보. Yonhap (dalam bahasa Korean). Dicapai pada January 30, 2014.CS1 maint: unrecognized language (link), translated to English at "Ssangyoon Sub-Unit to Debut in January". 4-minutes Forum. December 24, 2012. Diarkibkan daripada yang asal pada 2013-01-10. Dicapai pada February 25, 2013.