<ul><li><a href=https://www.imda.gov.sg/regulations-and-licensing/Regulations/Codes-of-Practice/Codes-of-Practice-and-Guidelines---Infocomm target=_blank>Telecommunications Act(chapter 323)Code of practice for competition in the provision of telecommunication services 2012(Telecommunications Act(chapter 323)Code of practice for competition in the provision of telecommunication services 2012. Entered into force on 22 April 2012. Section 6.5)</a></li><li><a href=https://www.imda.gov.sg/regulations-and-licensing-listing/interconnection-and-access-agreements/singtel-s-reference-interconnection-offer--rio target=_blank>IMDA (Infocomm Media Development Authority) official website(Singtel's Reference Interconnection Offer (RIO))</a></li><li><a href=https://www.imda.gov.sg/-/media/Imda/Files/Regulation-Licensing-and-Consultations/Frameworks-and-Policies/Competition-Management/Telecom-Competition-Code/Published-Notification-for-DTL-M1-Net.pdf target=_blank>Amendment of classification of dominant licensee 2012( Telecommunications Act(chapter  323) telecommunications (designated telecommunication licensees) (amendment)notification  2017. Issued on 13 September 2017. )</a></li></ul>