Stefańczyk WT. Kupiłem grejpfrut vs. kupiłem grejpfruta (‘I have bought a grapefruit’). Language mistakes in teaching Polish. KPC [Internet]. 2015 Jan. 1 [cited 2025 Dec. 5];22:99-105. Available from: https://www.czasopisma.uni.lodz.pl/kpc/article/view/22115