Reid, David A. et al. "Obsidian Procurement and Exchange at the Apogee of Empire: Wari Political Economy in Arequipa, Peru." Latin American Antiquity, vol. 36, no. 1, 2025, pp. 160–80, Cambridge Core, doi:10.1017/laq.2023.68.
only did a definition on About.com
only did a definition on About.com