Opiola, W., & Czepil, B. (2020). Ethnic diversity and local governance quality: The case of Opole Province in Poland. Peter Lang International Academic Publishing Group.
Čikaški stil citiranja (17. izdanje)Opiola, Wojciech, i Bartosz Czepil. Ethnic Diversity and Local Governance Quality: The Case of Opole Province in Poland. Bern: Peter Lang International Academic Publishing Group, 2020.
MLA način citiranja (9. izdanje)Opiola, Wojciech, i Bartosz Czepil. Ethnic Diversity and Local Governance Quality: The Case of Opole Province in Poland. Peter Lang International Academic Publishing Group, 2020.
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