GOYAL, N.; GOEL, V.; KAPOOR, S. Value Addition in Mobile Services and MMS. Journal of Commerce and Trade , "Meerut, India", v. 4, n. 2, p. 20–24, 2009. DOI: 10.26703/jct.v4i2.419. Disponível em: https://jctindia.org/index.php/jct/article/view/o09-ngvgsk. Acesso em: 6 feb. 2025.