PATEL, P. R. M. P.; , MR. V K SOLANKI. Search Engine Optimization (SEO) vs. Pay-Per-Click (PPC): A Comparative Study of ROI for Small Businesses. International Journal of Technical Innovation in Modern Engineering & Science, [S. l.], v. 12, n. 1, p. 4–6, 2026. Disponível em: https://www.ijtimes.com/index.php/ijtimes/article/view/3511. Acesso em: 12 may. 2026.