- EU Commission Directive 96/68/EC on the methodology of residue studies, amending Council Directive 91/414/EEC concerning the placing of plant protection products on the market, 21 October 1996

- Commission of the European Communities Working Document 7029/VI/95 rev. 5 Appendix B: “General Recommendations for the Design, Preparation and Realization of Residue Trials, 22 July 1997.”

- EPPO guidelines