Adamska, Małgorzata. “The Role of Human Capital in the Customer Relationship Management. The Results of Research in Small and Medium-Sized Enterprises of the Opolskie Voivodship”. Regional Barometer. Analyses & Prognoses 14, no. 4 (February 16, 2017): 155–161. Accessed May 30, 2025. https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/476.