1. Markman J Narasimhan SK Treatment of pain The Merck Manual Merck Sharp &;#38; Dohme Corp. Kenilworth, N.J., U.S.A. http://www.merckmanuals.com/professional/neurologic-disorders/pain/treatment-of-pain
2. Scott H. Edwards Nonsteroidal Anti&;#x02010;inflammatory Drugs The Merck Veterinary Manual Merck Sharp &;#38; Dohme Corp., a subsidiary of Merck &;#38; Co., Inc. Kenilworth, N.J., U.S.A. http://www.merckvetmanual.com/mvm/pharmacology/anti-inflammatory_agents/nonsteroidal_anti-inflammatory_drugs.html
3. DeRuiter J. Principles of Drug Action 2 http://www.scribd.com/doc/208784763/NSAIDs-Jack-DeRuiter-Principles-of-Drug-Action-2-Fall-2002#scribd
4. European Food Safety Authority Press Release, EU agencies consider phenylbutazone detected in horsemeat of low concern for consumers; recommend improved horse traceability and monitoring of veterinary medicinal residues http://www.efsa.europa.eu/en/press/news/130415