Czyżewski, Andrzej, and Jakub Staniszewski. 2015. “THE PRICE CONDITIONS AND CHANGES OF THE STRUCTURE OF PRODUCTION FACTORS IN POLISH AGRICULTURE IN YEARS 1999-2013”. Annals of Agricultural Economics and Rural Development 102 (4):7-17. https://doi.org/10.22630/RNR.2015.102.4.32.