Gołaś, Z., and S. Paszkowski. “STRUCTURE AND DETERMINANTS OF RETURN ON EQUITY IN AGRICULTURE IN CENTRAL-EASTERN EUROPEAN COUNTRIES”. Acta Scientiarum Polonorum. Oeconomia, vol. 9, no. 1, Mar. 2010, pp. 61-72, https://aspe.sggw.edu.pl/article/view/744.