M. . Husnah, N. . Andriani, and N. Nurbaiti, “The Effect of Purchases on Comparison and Level of Service Quality in the E-Commerce Web Area (Case Study of Tokopedia and Bukalapak)”, j.ekonomi, j.manajemen, j.bisnis, j.akuntansi, vol. 1, no. 2, pp. 257–262, Dec. 2021.