Skąpska, Elżbieta, Ewa Rollnik-Sadowska, and Ewelina Konicka. “Methods of Increasing Labour Productivity in Service Enterprise”. Olsztyn Economic Journal 12, no. 4 (December 11, 2017): 387–399. Accessed April 18, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/2838.