Sobczyński, Marek. “Methodical Problems in the Process of Development of the ‘Atlas of World Political Changes in 20th and 21st centuries’”. Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica, no. 21 (January 1, 2015): 5–35. Accessed December 6, 2025. https://czasopisma.uni.lodz.pl/fgsoe/article/view/20856.