1. Doyle, M. E. (2006). Veterinary drug residues in processed meats—potential health risk, http://fri.wisc.edu/docs/pdf/FRIBrief
2. Chai, N. (2009). Proceedings of the 4th International Baytril Symposium (pp. 44–– 61). Italy: Florence.
3. Converse, K. A. (2007) In N. J. Thomas, D. B. Hunter, & C. T. Atkinson (Eds.), Infectious diseases of wild birds. Blackwell Publishing, Ames, Iowa, USA. pp. 289-302.
4. Michelle, B. R., Jennifer, A., Waldoch, J., Pittman, M., Mark, G., Papich, B., & Hartup, K. (2004). Journal of Avian Medicine and Surgery, 18(3), 144–150.
5. Centre for Health Protection, (2011). Safe use of antibiotics, http://chp.gov.hk/en/view_content/22878.html .