Sadkowski, Wojciech. “Identification of the Scale of Implementation of Certified Quality Management Systems in Service Companies”. Studies of the Industrial Geography Commission of the Polish Geographical Society 31, no. 1 (March 29, 2017): 97–107. Accessed May 3, 2024. https://prace-kgp.uken.krakow.pl/article/view/20801653.311.7.