Kusuma, Hero Wirasmara. “Analysis of The Effect of Promotion on the Sales of General Insurance Services at PT. Wahana Tata Insurance”. International Journal of Business and Social Science Research 2, no. 1 (January 23, 2021): 20–24. Accessed March 28, 2024. https://ijbssrnet.com/index.php/ijbssr/article/view/41.