URTĀNS, Juris. KRUSTPILS DZIRKAĻI HILLFORT. NEW INSIGHTS. Via Latgalica, Rezekne, Latvia, n. 10, p. 8–21, 2017. DOI: 10.17770/latg2017.10.2769. Disponível em: https://journals.rta.lv/index.php/LATG/article/view/2769.. Acesso em: 8 may. 2024.