SAEZ-RODRIGUEZ, A. Knot numbers used as labels for identifying subject matter of a khipu. Revista Latinoamericana de Etnomatemática, [S. l.], v. 6, n. 1, p. 4-19, 2013. Disponível em: https://revista.etnomatematica.org/index.php/RevLatEm/article/view/52. Acesso em: 20 oct. 2020.