Zahra, A., and J. Nasution. “The Effectiveness of Gadget Protection Implementation in Purchasing Gadgets at Shopee Indonesia E-Commerce”. Jurnal MANDIRI: Ilmu Pengetahuan, Seni, Dan Teknologi, Vol. 7, no. 1, June 2023, pp. 22 -33, doi:10.33753/mandiri.v7i1.230.