KILIUS, Liudvika. Privalomojo egzemplioriaus raida Lietuvoje. Relevant Tomorrow, [S. l.], p. 16–20, 1999. DOI: 10.51740/rt.vi.644. Disponível em: https://journals.lnb.lt/relevant-tomorrow/article/view/644. Acesso em: 3 may. 2024.