Jaroszewska, J., and R. Pietrzykowski. “DYNAMICS OF LABOUR PRODUCTIVITY CHANGES IN AGRICULTURE AT THE REGIONAL LEVEL IN SELECTED EUROPEAN UNION COUNTRIES”. Acta Scientiarum Polonorum. Oeconomia, vol. 17, no. 2, June 2018, pp. 59-68, doi:10.22630/ASPE.2018.17.2.21.