GUPTA, Nimit. Permission Marketing: An Analysis with Reference to Banking Promotional E-mails. Indian Journal of Marketing, [S. l.], v. 45, n. 7, p. 48–55, 2015. DOI: 10.17010/ijom/2015/v45/i7/79929. Disponível em: https://indianjournalofmarketing.com/index.php/ijom/article/view/79929. Acesso em: 9 oct. 2025.