MANN, Ludovic McLellan; SCOTT, A; PETRIE, W M Flinders. The Prehistoric and Early Use of Pitchstone and Obsidian: With Report on Petrology; and a Note of Egyptian and Aegean Discoveries. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 52, p. 140–149, 1918. DOI: 10.9750/PSAS.052.140.149. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7425. Acesso em: 19 apr. 2024.