Abdul Hadi M, Eri Besra, Verinita. The Effect of Perceived Risk and Perceived Usefulness on Purchase Intention with Customer Attitude as a Mediation Variable (Survey of Tokopedia Consumers in Padang City). enrichment [Internet]. 2022Oct.18 [cited 2026Apr.18];12(4):2918-30. Available from: https://www.enrichment.iocspublisher.org/index.php/enrichment/article/view/754