Jasiński, K. 1957. Review: J. Umiński, The establishment of the Poznań bishopric and the dependent Archdeaconry of Czersk. "Catholic Church News", Wrocław 1952. Our Past. 5, (Jun. 1957), 293–297. DOI:https://doi.org/10.52204/np.1957.5.293-297.