ALLEN, John Romilly. Notes on Early Christian Symbolism. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 18, p. 380–464, 1884. DOI: 10.9750/PSAS.018.380.464. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6118. Acesso em: 19 apr. 2024.