1. US Food and Drug Administration (2011). http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=556.770
2. Ministry of Agriculture of the People’s Republic of China (2003) The Ministry of Agriculture Bulletin of PRC235-the maximum residue limits for veterinary drugs in foods
3. Webster GK (1998) J Agric Food Chem 46:3623–3629
4. AOAC Official Method 961.26 (1962) Zoalene in feeds spectrophotometric method
5. AOAC Official Method 966.26 (1967) Zoalene residues in animal tissues spectrophotometric method