Kalvāne, Skaidrīte. “SOME NOTES ON LATGALIAN BOOKS IN THE MASSIVE UNION CATALOGUE „ANCIENT PRINTS IN LATVIAN 1525–1855” (1999)”. Via Latgalica, no. 4 (December 31, 2012): 6–13. Accessed April 28, 2024. https://journals.rta.lv/index.php/LATG/article/view/1686.