NASSER S. IBRAHIM, A.; عبد. Pyramid Marketing Via Internet and its Effect on clients. Regional Studies Journal (RSJ), [S. l.], v. 9, n. 26, p. 279–316, 2025. DOI: 10.33899/regs.2012.35987. Disponível em: https://rjps.uomosul.edu.iq/index.php/rsj/article/view/14850. Acesso em: 5 aug. 2025.