1. Avert.info. (2016). HIV/AIDS in South Africa. Retrieved on May 30, 2018, from http: //
www.avert.org/professionals/hiv-around-world/sub-saharan-africa
.
2. Belting J. (2008). Empirical Methods: Expert Interviews.
3. Caputi, P., & Balnaves, M. (2001). Introduction to quantitative research methods: An investigative approach. Retrieved on June 26, 2018, from
https://www.worldcat.org
.
4. Centers for Disease Control and Prevention (CDC). (2012). HIV surveillance report: Special report. Retrieved on May 30, 2018, from
https://www.cdc.gov/hiv/pdf/library/reports/surveillance/cdc-hiv-HSSR_NHBS_PWID_2012.pdf
.
5. Douglas, M. (1996). Principles and practice of infectious diseases. Retrieved on June 27, 2018, from
https://www.sciencedirect.com
.