Singh, Uma Shankar, and Osman Sahin. “Measuring the Effectiveness of Sales Promotion Activities on Brand Loyalty: A Study on COCA COLA”. International Journal of Social Sciences & Educational Studies 3, no. 3 (March 1, 2017): 159–173. Accessed April 16, 2026. https://www.ijsses.tiu.edu.iq/index.php/ijsses/article/view/551.