1. Temperature indicators - the state of the art’;Byrne;Food Technology,1976
2. CAMBELL L A, 1986, Use of a time-temperature indicator in monitoring quality of refrigerated salads, M. S. Thesis, Michigan State University.
3. Packaged milk, cream and cottage cheese can be monitored for freshness using polymer indicator labels’;Chen;Dairy Food Sanitation,1987
4. Refrigerated Orange Juice can be monitored for freshness using a polymer indicator label’;Chen;Dairy Food Sanitation,1987
5. CODEX COMMITTEE ON FOOD HYGIENE, 1997, ‘Revised International Code of Practice - General Principles of Food Hygiene’, WHO/FNU/97, 1997.