Kostecka, Joanna. “House Martin Delichon Urbicum Case Study As a Reason to Consider the Need of Retardation of Processing of Natural Re-Sources and Protection of Ecosystems’ Services”. Problemy Ekorozwoju, vol. 6, no. 1, Jan. 2011, pp. 139-44, https://ph.pollub.pl/index.php/preko/article/view/4808.