Eemy Nurbaety, and Rohmadi. “The The Influence of Purchasing Power and Service Quality on Sales Levels Fitra Shopp Online Shop in East Lampung Regency: Introduction, Result, Discussion, Material and Methods, Conclusions, and References”. Journal of Economic and Business Analysis, vol. 1, no. 2, Dec. 2023, pp. 62-71, https://businessandfinanceanalyst.com/index.php/JEBA/article/view/86.