1. EN 45001 — General criteria for the operation of testing laboratories,1989
2. ISO 4833 Microbiology of food and animal feedingstuffs — General guidance for the enumeration of micro-organisms — Colony count technique at 30 degrees C,1989
3. FIL 122b Milk and milk products — Preparation of samples and dilutions for microbiological examination,1992
4. ISO 7402 Microbiology of food and animal feedingstuffs — Enumeration of Enterobacteriaceae,1993
5. EN ISO 11290-1 Microbiology of food and animal feedingstuffs — Horizontal method for the detection and enumeration of Listeria monocytogenes — Part 1: Detection,1997