Brichieri-Colombi, Stephen. “A Spurred Spiral Ramp for the Great Pyramid of Giza”. PalArch’s Journal of Archaeology of Egypt / Egyptology 17, no. 3 (October 23, 2020): 1–20. Accessed November 5, 2025. https://www.archives.palarch.nl/index.php/jae/article/view/5.