Tracz-Krupa, Katarzyna. “The Practice of Training of Local Administration in Opolskie Voivodship — the Research Findings”. Regional Barometer. Analyses & Prognoses, no. 4 (26) (January 3, 2012): 85–93. Accessed July 5, 2024. https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1309.