Roep, D., and H. Oostindie. “Multifunctional Agriculture in Perspective: Conceptualisations and Debate in Dutch Policy and Research”. Journal of Agribusiness and Rural Development, Vol. 4, no. 359, Dec. 2005, pp. 105-11, http://www1.up.poznan.pl/jard/index.php/jard/article/view/1005.