Wach, Krzysztof (2007): Regional social mobility as a factor affecting small and medium-sized enterprises’ development. Published in: „Economics & Competition Policy” No 8. (Competitiveness of Labour Market, red. D. Kopycińska, Microeconomics Department of University of Szczecin, Szczecin 2007. , Vol. ISBN 9, No. 8 (2007): pp. 87-94.