Gotkiewicz, W., and B. Mickiewicz. “The Realization of the Agri-Environmental Management Scheme in the Area of Natura 2000 in the Valley of Biebrza River”. Journal of Agribusiness and Rural Development, Vol. 38, no. 4, Dec. 2015, pp. 657-64, doi:10.17306/JARD.2015.70.