Makarewicz-Marcinkiewicz, Agnieszka. “The Holistic Concept of Sustainable Development in Strategies of Polish Voivodeships to the Year 2020”. Problemy Ekorozwoju, vol. 10, no. 2, July 2015, pp. 71-78, https://ph.pollub.pl/index.php/preko/article/view/4914.