Adamska, Małgorzata. “Studies of the Demand for Knowledge-Based Services in Enterprises of the Opolskie Voivodship”. Regional Barometer. Analyses & Prognoses 15, no. 4 (February 16, 2018): 155–162. Accessed December 5, 2025. https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/417.