Safitriani, L., I. G. Arimbawa, A. Baktiono, and E. Damayanti. “ANALYSIS OF PRODUCT QUALITY, SALES PROMOTION, BRAND IMAGES, AND AFTER-SALES SERVICE TOWARDS SAMSUNG GADGET PURCHASE DECISIONS”. IJEEIT : International Journal of Electrical Engineering and Information Technology, Vol. 2, no. 2, Oct. 2020, pp. 1-9, doi:10.29138/ijeeit.v2i2.1152.