Nur Elsa Harahap, Yayuk Yuliana, Suhaila Husna Samosir, and Julianto Hutasuhut, “The Effect of Viral Marketing, Celebrity Endorsement, and Online Customer Review on Purchase Satisfaction of Glad2Glow Skincare Products : Case Study on the Use of Glad2Glow Skincare Garu II Medan Amplas”, IJEMS, vol. 3, no. 3, pp. 199–206, Aug. 2026.