1. Commission Regulation (EC) No 127/2008 of 13 February 2008 entering a designation in the register of protected designations of origin and protected geographical indications (Oscypek (PDO)). https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2008:040:0005:0006:EN:PDF.
2. PN-ISO 4121:1998. Sensory analysis–Methodology–Evaluation of food products using scaling methods.
3. PN-ISO 11870:2016-07. Milk and milk products – Determination of fat content. General guidance on the use of butyrometric methods.
4. PN-EN ISO 8968-1:2014-03. Milk and milk products – Determination of nitrogen content – Part 1: Kjeldahl principle and calculation of crude protein.