janw. (2017, November 5). The automatic medication dispencer. Instructables. Retrieved December 22, 2021, from https://www.instructables.com/The-Automatic-Medication-Dispencer/
Mukund, S., & Srinath, N. K. (2012). Design O automatic medication dispenser - csitcp.com. Design of Automatic Medication Dispenser. Retrieved December 8, 2021, from https://www.csitcp.com/paper/2/23csit24.pdf.
Hero Pill Dispenser, Medication Manager & Pill Organizer. Hero Health. (2021). Retrieved December 22, 2021, from https://herohealth.com/
Schechinger, Anne. “In Minnesota's Farm Country, Nitrate Pollution of Drinking Water Is Getting Worse.” Environmental Working Group – Know Your Choices, 4 Mar. 2020, www.ewg.org/interactive-maps/2020-in-minnesotas-farm-country-nitrate-pollution-of-drinking-water-getting-worse/.
Mahvi, A.H., Nouri, J., Babaei, A.A. et al. Agricultural activities impact on groundwater nitrate pollution. Int. J. Environ. Sci. Technol. 2, 41–47 (2005). https://doi.org/10.1007/BF03325856
https://www.watereducation.org/aquapedia/nitrate-contamination