Baran, E., i P. Tomaszewski. „Apparent and actual depopulation of medium-sized cities of the transborder region of podkarpackie voivodship”. TRANSBORDER ECONOMICS. International Journal on Transborder Economics, Finance, Politics and Statistics., t. 3, nr 1, grudzień 2018, s. 43-55, https://journals.ur.edu.pl/te/article/view/8529.