1. AENOR. (2003).RSS Microbiology of food and animal feeding stuffs – Horizontal method for the enumeration of microorganisms – Colony-count technique at 30 degrees C. ISO 4833:2003.Madrid: AENOR
2. AENOR. (2006).RSS Microbiology of food and animal feeding stuffs – Horizontal method for the enumeration of coliforms – Colony-count technique.ISO 4832:2006. Madrid: AENOR
3. AENOR. (2008).RSS Microbiology of food and animal feeding stuffs – Horizontal method for the enumeration of yeasts and moulds – Part 1: Colony count technique in products with water activity greater than 0,95.ISO 21527-1:2008. Madrid: AENOR