Maciąg-Fiedler, Agnieszka. “Michał Głuszkowski: Code-Switching and Code-Mixing in the Conditions of Slavic-Slavic Language Contact. Vershina – a Unique Polish Language Island in Siberia, Wydawnictwo Naukowe Uniwersytetu Mikołaja Kopernika, Toruń 2024, Pp. 252”. Papers in Linguistics, vol. 28, no. 3, Sept. 2026, pp. 319-24, doi:10.31648/pj.12947.