Purwaningrum, M. R., and L. H. Pasaribu. “The Influence of Service Quality, Promotion, and Secure Transaction Towards Purchase Decision (Study Case on Tokopedia.Com) ”. Enrichment : Journal of Management, Vol. 12, no. 1, Aug. 2021, pp. 190-6, doi:10.35335/enrichment.v12i1.189.