STUPAR-RUTENFRANS, S.; DE KOFF, D.; VAN DEN ELST, J. The Effect of Subject Lines on Open Rates of Email Marketing Messages. Advances in Social Sciences Research Journal, [S. l.], v. 6, n. 7, p. 181–188, 2019. DOI: 10.14738/assrj.67.6749. Disponível em: https://journals.scholarpublishing.org/index.php/ASSRJ/article/view/6749. Acesso em: 29 mar. 2024.