World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
hpra.ie
"Omnipaque"(PDF). Ireland: Health Products Regulatory Authority. January 2018. Retrieved 31 July 2020.