Snarski, Sławomir. “EFFECTS OF SUPPORTING TOURISM IN PODLASKIE VOIVODSHIP UNDER THE CROSS-BORDER COOPERATION PROGRAMME POLAND – BELARUS – UKRAINE 2007-2013”. Economics and Environment, vol. 61, no. 2, Apr. 2017, p. 13, https://ekonomiaisrodowisko.pl/journal/article/view/279.