『宇多田ヒカルのうた』全貌明らかに。井上陽水、椎名林檎、浜崎あゆみ、吉井和哉ら参加アーティストコメント [All details revealed for Utada Hikaru no Uta, comments from contributing artists such as Yosui Inoue, Ringo Sheena, Ayumi Hamasaki and Kazuya Yoshii] (in Japanese). Barks.co.jp. December 3, 2014. Retrieved December 3, 2014.
"JASRAC賞" (in Japanese). JASRAC. Archived from the original on September 10, 2014. Retrieved August 27, 2014.
jvcmusic.co.jp
"リスペクト! J-POP". Victor Entertainment. Retrieved August 24, 2014.
musictvprogram.com
"1999 Yearly CD Chart" (in Japanese). Oricon; published through Music TV Program. 1999. Archived from the original on December 25, 2010. Retrieved January 22, 2017.
natalie.mu
"UNCHAINが宇多田、林檎、靖幸、キリンジ、少女時代カバー" [Unchain covers Utada, Ringo, Okamura, Kirinji and Girls Generation] (in Japanese). Natalie.mu. January 16, 2013. Retrieved May 3, 2014.
Kano (March 31, 2004). "Utada Hikaru Singles Collection Vol. 1" (in Japanese). Utada Hikaru's official website (www.utadahikaru.jp). Archived from the original on January 16, 2016. Retrieved January 22, 2017.
Kano (March 31, 2004). "Utada Hikaru Singles Collection Vol. 1" (in Japanese). Utada Hikaru's official website (www.utadahikaru.jp). Archived from the original on January 16, 2016. Retrieved January 22, 2017.
"JASRAC賞" (in Japanese). JASRAC. Archived from the original on September 10, 2014. Retrieved August 27, 2014.
"1999 Yearly CD Chart" (in Japanese). Oricon; published through Music TV Program. 1999. Archived from the original on December 25, 2010. Retrieved January 22, 2017.