Kalvāne, Skaidrīte. 2012. “SOME NOTES ON LATGALIAN BOOKS IN THE MASSIVE UNION CATALOGUE „ANCIENT PRINTS IN LATVIAN 1525–1855” (1999)”. Via Latgalica, no. 4 (December): 6-13. https://doi.org/10.17770/latg2012.4.1686.