@misc{Grądkowski_Waldemar_Filip_(1946-1993)._Category, author={Grądkowski, Waldemar Filip (1946-1993).}, howpublished={online}, publisher={UMCS}, language={eng}, type={artykuł}, title={Category of historical background as a component in Ludwik Krzywicki’s model of historical process}, keywords={socjologia, filozofia}, }