KASPEROWICZ-STĘPIEŃ, Alicja. Conditions for the Development of and a Certification and Control System for Ecological Agriculture in Poland. Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie, Krakow, n. 908, p. 75–91, 2015. DOI: 10.15678/krem.793. Disponível em: https://krem.uek.krakow.pl/index.php/krem/article/view/793.. Acesso em: 20 sep. 2024.