1. Improvement of chemical analysis of antibiotics
2. U.S. Code of Federal Regulations, Title 21, Part 558, Sections 128 and 450. U.S. Government Printing Office, Washington DC, 2003, (Chapter 1).
3. Confirmation of multiple tetracycline residues in milk and oxytetracycline in shrimp by liquid chromatography–particle beam mass spectrometry
4. U.S. Code of Federal Regulations, Title 21, Part 556, Sections 150, 500, and 720. U.S. Government Printing Office, Washington DC, 2003, (Chapter 1).
5. The European Agency for the Evaluation of Medicinal Products, EMEA/MRL/023/95, http://www.emea.eu.int/pdfs/vet/mrls/Tetracyclines(3)02395.pdf.