APA-ийн эшлэл(7 дахь хэвлэлт)

Czepil, B., & Opioa, W. (2020). Ethnic diversity and local governance quality: The case of Opole Province in Poland. Peter Lang.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Czepil, Bartosz, ба Wojciech Opioa. Ethnic Diversity and Local Governance Quality: The Case of Opole Province in Poland. Berlin: Peter Lang, 2020.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Czepil, Bartosz, ба Wojciech Opioa. Ethnic Diversity and Local Governance Quality: The Case of Opole Province in Poland. Peter Lang, 2020.