1. https://chemm.nlm.nih.gov/ammonia_hospital_mmg.htm.
2. Handbook of Neurochemistry and Molecular Neurobiology: Amino Acids and Peptides in the Nervous System;Albrecht,2007
3. Ammonia toxicity to the brain
4. https://www.cdc.gov/niosh/docs/81-123/pdfs/0028-rev.pdf.
5. http://www.rmtech.net/uses_of_ammonia.htm.