1. ISO-EN 9001, International Organization for Standardization, Gènève, 1994.
2. ISO-EN 9002, International Organization for Standardization, Gènève, 1994.
3. ISO-EN 9003, International Organization for Standardization, Gènève, 1994.
4. ISO Guide 25, International Organization for Standardization, Gènève, 1990.