Vassallo, M, Saba, A, Arvola, A, Dean, M, Messina, F, Winkelmann, M, Claupein, E, Lähteenmäki, L & Shepherd, R 2009, ' Willingness to use functional breads : Applying the Health Belief Model across four European countries ', Appetite, vol. 52, no. 2, pp. 452-460 . https://doi.org/10.1016/j.appet.2008.12.008