HORSKÁ, Elena - SPARKE, Kai. Marketing attitudes towards the functional food and implications for market segmentation. In Agricultural economics. - Prague : Institute of Agricultural and Food Information, 2007. ISSN 0139-570X, 2007, vol. 53, no. 8, s. 349-353. Dostupné na : <http://www.agriculturejournals.cz/publicFiles/00336.pdf>