Sedlak, P. Employee Net Promoter Score (eNPS) As a Single-Item Measure of Employee Work Satisfaction An Empirical Evidence from Companies Operating in Poland. W Contemporary organisation and management. Challenges and trends; Michałkiewicz, A., Mierzejewska, W., Red.; Wydawnictwo Uniwersytetu Łódzkiego: Poland, 2020; s. 347-357. https://doi.org/10.18778/8220-333-2.21.