HARZEM, P. In memoriam On the parting of our days from Fred Simmons Keller: sketches for a portrait of a great man. Mexican Journal of Behavior Analysis, [S. l.], v. 22, n. 1, p. 5–11, 2011. DOI: 10.5514/rmac.v22.i1.23489. Disponível em: https://journals.unam.mx/index.php/rmac/article/view/23489. Acesso em: 24 jul. 2024.