Konecka-Szydłowska, B., E. Zuzańska-Żyśko, and R. Szmytkie. “Role of Services in the Economies of Small Towns of Silesia Region and Wielkopolskie Voivodehip”. Bulletin of Geography. Socio-Economic Series, no. 14, Dec. 2010, pp. 51–62, doi:10.1515/v10089-010-0014-1.