^ Kim, Hyun (February 1999). "Revolutions" . Vibe . Vol. 7, no. 1. Time Inc. p. 139. ISSN 1070-4701 . Retrieved January 20, 2010 . [permanent dead link ]
^ Nathan, David (December 19, 1998). "A+ Makes Grade at Hempstead " . Billboard . Vol. 110, no. 51. Nielsen Business Media, Inc. p. 23. ISSN 0006-2510 . Retrieved January 20, 2010 .
^ "A+ – Enjoy Yourself" . ARIA Top 50 Singles . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" (in German). Ö3 Austria Top 40 . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" (in Dutch). Ultratop 50 . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" (in French). Ultratop 50 . Retrieved March 15, 2020.
^ "Eurochart Hot 100 Singles". Music & Media . Vol. 16, no. 8. February 20, 1999. p. 8.
^ "A+ – Enjoy Yourself" (in French). Les classement single . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" (in German). GfK Entertainment charts . Retrieved March 15, 2020.
^ "Nederlandse Top 40 – week 5, 1999 " (in Dutch). Dutch Top 40 . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" (in Dutch). Single Top 100 . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" . Top 40 Singles . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" . VG-lista . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" . Singles Top 100 . Retrieved March 15, 2020.
^ "A+ – Enjoy Yourself" . Swiss Singles Chart . Retrieved March 15, 2020.
^ "Official Singles Chart Top 100" . Official Charts Company . Retrieved March 15, 2020.
^ "A+ Chart History (Hot 100)" . Billboard . Retrieved March 15, 2020.
^ "A+ Chart History (Hot R&B/Hip-Hop Songs)" . Billboard . Retrieved March 15, 2020.
^ "A+ Chart History (Hot Rap Songs)" . Billboard . Retrieved March 15, 2020.
^ "Jaaroverzichten 1999" (in Dutch). Ultratop. Retrieved March 15, 2020 .
^ "Rapports Annuels 1999" (in French). Ultratop. Retrieved March 15, 2020 .
^ "Year in Focus: Eurochart Hot 100 Singles 1999". Music & Media . Vol. 17, no. 1. January 1, 2000. p. 11.
^ "Top 100–Jaaroverzicht van 1999" . Dutch Top 40. Retrieved March 15, 2020 .
^ "Jaaroverzichten – Single 1999" (in Dutch). MegaCharts . Retrieved March 15, 2020 .
^ "Best Sellers of 1999: Singles Top 100". Music Week . January 22, 2000. p. 27.
^ "New Releases / AddVance Notice". Radio & Records . No. 1268. October 2, 1998. pp. 49, 56.
^ "エンジョイ・ユアセルフ~ベートーベン'99 | A+" [Enjoy Yourself ~ Beethoven '99 | A+] (in Japanese). Oricon . Retrieved October 6, 2023 .
^ "New Releases: Singles". Music Week . January 30, 1999. p. 26.