Mielczarek , Małgorzata. 2007. Записки Горного института 170 (2), 242-45. https://pmi.spmi.ru/pmi/article/view/7762.

Mielczarek , Małgorzata. 2007. "The Directions of Development As a Chance for Small Family Farms". Journal of Mining Institute 170 (2), 242-45. https://pmi.spmi.ru/pmi/article/view/7762.