Where did Isaac and Mateusz come from, murdered in a hermitage in Greater Poland? 467-481 Ryszard Grzesik
The highways and byways of Christianisation in the indigenous cults of the late Middle Ages: With reference to the work of Aleksandra Witkowska, "Pilgrimage cults of fifteenth-century Krakow. From research on urban religious culture". Lublin 1984, pp. 253, 4 maps. 269-279 Jan Kracik