S. B. -, Ergo Nurpatria Kurniawan, Fendy Manunggal W, and M. Alwi, “The Effect of Product Quality and Promotional Activities on Purchasing Decisions Mediated by The Price of Bear Brand Milk Drink Products During The Covid-19 Pandemic”, enrichment, vol. 12, no. 2, pp. 2269-2273, May 2022.