Alfaizi, Y., R. Hardini, and K. Digdowiseiso. “The Influence of Product Quality, Online Promotion and Price Perception on Buying Interest in Kopi Kenangan at Epicentrum Mall”. Jurnal Syntax Admiration, vol. 4, no. 3, Mar. 2023, pp. 559-68, doi:10.46799/jsa.v4i3.912.