Ariyanis S, R. M. . ., V. Dhameria, and E. . Pratiwi. “The Effect of Promotions Through Instagram Social Media on Purchase Decisions at the Shopee Marketplace”. Jurnal Mantik, vol. 5, no. 3, Oct. 2021, pp. 1578-83, https://www.ejournal.iocscience.org/index.php/mantik/article/view/1501.