Jocellyn Regina 2023. Examining the Impact of Product Quality, Social Media Advertisement, and Product Differentiation on Customer Purchasing Decision at Miramar Restaurant, Pematang Siantar. International Journal of Economics, Business Management and Accounting (IJEBMA). 1, 2 (Oct. 2023), 107–136. DOI:https://doi.org/10.59890/ijebma.v1i2.230.