1. 1. Joint United Nations Programme on HIV/AIDS, Global HIVand AIDS statistics – Fact sheet, 2021, https://www.unaids.org/sites/default/files/media_asset/UNAIDS_FactSheet_en.pdf
2. 2. Ministry of Health Republic of Indonesia, Infodatin HIV dan. AIDS 2020;2020, https://pusdatin.kemkes.go.id/resources/download/pusdatin/infodatin/infodatin-2020-HIV.pdf
3. 3. World Health Organization, Guidance on Couples HIV Testing and Counselling Including Antiretroviral Therapy for Treatment and Prevention in Serodiscordant Couples: Recommendations for a. Public Health Approach, 2012, https://apps.who.int/iris/bitstream/handle/10665/44646/9789241501972_eng.pdf?sequence=1andisAllowed=y
4. 4. De Walque D. Sero-discordant couples in five African countries: implications for prevention strategies. Popul Dev Rev 2007;33(3):501–523. DOI: 10.1111/j.1728-4457.2007.00182.x
5. 5. Lingappa JR, Lambdin B, Bukusi EA, et al. Regional differences in prevalence of HIV-1 discordance in Africa and enrollment of HIV-1 discordant couples into an HIV-1 prevention trial. PLoS One 2008;3(1):e1411. DOI: 10.1371/journal.pone.0001411