Moore, Phillip R. “Regional Variations and Temporal Changes in the Prehistoric Use of Obsidian and Chert in the North Island of New Zealand”. Waka Kuaka 130, no. 2 (July 7, 2021): 149–188. Accessed October 19, 2025. https://www.thepolynesiansociety.org/index.php/JPS/article/view/519.