Ostromęcki A, Mantaj A, Zając D. THE IMPORTANCE OF NON-AGRICULTURAL ECONOMIC ACTIVITY OF FARMERS IN THE MODERNIZATION PROCESS OF FARMS. aspe [Internet]. 2015 Dec. 30 [cited 2024 Dec. 22];14(4):83-92. Available from: https://aspe.sggw.edu.pl/article/view/418