Trott, Robert E (12 January 1994). "Product Specification". Agricultural and Rural Development DOOR. European Commission. Archived from the original on 5 March 2016. Retrieved 24 January 2016.
Trott, Robert E (12 January 1994). "Product Specification". Agricultural and Rural Development DOOR. European Commission. Archived from the original on 5 March 2016. Retrieved 24 January 2016.