1. Chemistry and Physics in Tasmanian Agriculture, http://www.launc.tased.edu.au/online/sciences/agsci/alkalo/opiates.htm.
2. Chemistry of Opioid Analgesics PHA 422 Neurology Pharmacotherapeutics, http://wizard.pharm.wayne.edu/medicine/opioid.html.
3. Scientific Working Drug for the Analysis of Seized Drugs, http://www.swgdrug.orgmonographs.htm#A.
4. Alcaliber Company, http://alcaliber.com/compania/.
5. Alcaliber, Trade and Security, http://alcaliber.com/compania/regulacion-internacional/.