COHEN, J.; ROBLES, E. Desk calculators as print-out counters. Mexican Journal of Behavior Analysis, [S. l.], v. 1, n. 1, p. 171–171, 2011. DOI: 10.5514/rmac.v1.i1.26841. Disponível em: https://revistas.unam.mx/index.php/rmac/article/view/26841. Acesso em: 6 may. 2024.