WĄSIKIEWICZ-RUSNAK, Urszula. “INTEGRATED MANAGEMENT OF THE ISO 9000, ISO 14000 AND PN-N 18001 SYSTEMS OF STANDARDS AT A SELECTED ENTERPRISE”. Economic and Environmental Studies 11 (June 17, 2021): 203–209. Accessed November 22, 2024. https://czasopisma.uni.opole.pl/index.php/ees/article/view/4166.