Marpaung N, Siregar OM. The Effect of Dual Pricing and Promotional Strategies on Traders Income in Tourism Villages, Samosir Regency. IJBA [Internet]. 2023 Oct. 18 [cited 2024 Sep. 19];3(5):1775-90. Available from: https://journal.formosapublisher.org/index.php/ijba/article/view/5529