Reinati, Stefanus, and David R.E. Selan. 2022. “The Impact of Promotional Costs on the Sales Unit of Honda Beat Motorcycles: Case in Kupang- Indonesia”. The International Journal of Social Sciences World (TIJOSSW) 4 (1):46-52. https://www.growingscholar.org/journal/index.php/TIJOSSW/article/view/181.