Piekut, Marlena. “Expenditure on Goods and Services Related to Intellectual Development Household Members from the Perspective of Rural Household Budgets ”. Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica, no. 20, Jan. 2015, pp. 59-73, doi:10.18778/1508-1117.20.04.