“Knot Numbers Used As Labels for Identifying Subject Matter of a Khipu”. Revista Latinoamericana de Etnomatemática Perspectivas Socioculturales de la Educación Matemática 6, no. 1 (March 2, 2013): 4–19. Accessed January 1, 2026. https://www.revista.etnomatematica.org/index.php/RevLatEm/article/view/52.