1. National survey on veterinarian – initiated drug use in lactating dairy cows;Sundlof;J. Am. Vet. Med. Assoc.,1995
2. U.S. Code of Federal Regulations, 21 CFR 520.1720 and 522.1720, 1988.
3. Use of non-steroidal anti-inflammatory drugs in food animal practice;Kopcha;J. Am. Vet. Med. Assoc.,1992
4. Extra-label use of non-steroidal anti-inflammatory drugs in cattle;Smith;J. Am. Vet. Med. Assoc.,2008
5. SANCO 2000. European Commission-Reference Laboratory for Residues of Veterinary Drugs. Workshop Manual: NSAIDs and Validation According to SANCO 1805/2000, Berlin, 07–09 May 2001.