1. Pharmaceutical Waste;Castensson,2008
2. OTC Retail Sales 1964–2017https://www.chpa.org/otcretailsales.aspx
3. Over the Counter (OTC) & Diet Supplementary Market Global Scenario, Market Size, Trend and Forecast, 2015–2024https://www.variantmarketresearch.com/report-categories/pharmaceuticals/over-the-counter-otc-diet-supplementary-market
4. Pharmaceuticals in the Environment—The Global Perspective Occurrence, Effects, and Potential Cooperative Action under SAICM;Weber,2014
5. Economic Consequences of Unused Medications in Houston, Texas