Szmielińska-Pietraszek, P., and W. Szymańska. “The Industrial Area of Szczecinek and Lębork in Regional Structure of the Pomorskie and Zachodniopomorskie Voivodeships”. Studies of the Industrial Geography Commission of the Polish Geographical Society, vol. 10, Jan. 2008, pp. 35-44, doi:10.24917/20801653.10.3.