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Hauzan Arrafi Hudzaifah and Nabila Kharimah Vedy 2026. The Effectiveness Of Using Whatsapp Business And A Website In Supporting Business-To-Business Sales at PT Baja Kurnia. International Journal of Economics, Business and Innovation Research. 5, 06 (Oct. 2026), 371-385. DOI:https://doi.org/10.63922/ijebir.v5i06.6796.