"Swear It Again" is a 1999 debut single by Irish group Westlife and is the leading single from their debut studio album Westlife. It went to number 1 in the United Kingdom, New Zealand and Ireland, number 20 in the United States and Spain, number 12 in Sweden and Australia, number 2 in Scotland, number 31 in Iceland, number 27 in the Netherlands, number 25 in Switzerland and number 28 in Canada.
↑Swear It Again (UK CD2 liner notes). Westlife. RCA Records, BMG. 1999. 74321 66207 2.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (UK cassette single sleeve). Westlife. RCA Records, BMG. 1999. 74321 662064.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (European CD single liner notes). Westlife. RCA Records, BMG. 1999. 74321 66357 2.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (US CD single liner notes). Westlife. Arista Records, BMG. 2000. 07822-13816-2.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (US cassette single sleeve). Westlife. Arista Records, BMG. 1999. 07822-13816-4.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (Australian CD single liner notes). Westlife. RCA Records, BMG. 1999. 74321 66356 2.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (Australian CD EP liner notes). Westlife. RCA Records, BMG. 1999. 74321 68416 2.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)
↑Swear It Again (Japanese CD EP liner notes). Westlife. RCA Records, BMG. 1999. BVCP-28001.{cite AV media notes}: CS1 maint: others in cite AV media (notes) (link)