Musa, H., S. C. H. Li, Z. A. Abas, and N. Mohamad. “Adoption Factor of Mobile Marketing: The Case of Small Medium Enterprises (SMEs) in Malaysia”. International Review of Management and Marketing, vol. 6, no. 7S, Oct. 2016, pp. 112-5, https://econjournals.com/index.php/irmm/article/view/3211.