MONJARÁS-RUIZ, J. Sobre Ted J. J. Leyenaar, Ulama - The perpetuation in Mexico of the Pre-Spanish ball game ullamaliztli. Historia Mexicana, [S. l.], v. 28, n. 4, p. 622–624, 1979. Disponível em: https://historiamexicana.colmex.mx/index.php/RHM/article/view/2721. Acesso em: 6 may. 2024.