Krzemień , Alicja, и Aleksandra Dyszy. 2007. Записки Горного института 170 (2), 200-202. https://pmi.spmi.ru/pmi/article/view/7750.

Krzemień , Alicja, and Aleksandra Dyszy. 2007. "Occupational Health and Safety Management Rules According to Pier-Merit Program in Polish Coal Mines". Journal of Mining Institute 170 (2), 200-202. https://pmi.spmi.ru/pmi/article/view/7750.