CABANILLA, C. Pirámides de naipes. Economía y Negocios, [S. l.], n. 1, p. 79–89, 2009. DOI: 10.29019/eyn.v0i1.143. Disponível em: https://server2.ute.edu.ec/index.php/economia-y-negocios/article/view/143. Acesso em: 18 ago. 2022.