CRUCERU, A. F.; RĂDULESCU, V. Marketing Productivity Analysis. International Journal of Economic Practices and Theories, [S. l.], v. 4, n. 5, p. 791-795, 2014. Disponível em: http://mta.ase.ro/index.php/ijept/article/view/Marketing_Productivity_Analysis. Acesso em: 26 jul. 2026.