Kholiq, I., and D. K. Sari. “The Influence of Viral Marketing, Celebrity Endorser, and Brand Awareness on Purchase Decisions on Make Over Cosmetic Products in Sidoarjo”. Academia Open, Vol. 4, June 2021, p. 10.21070/acopen.4.2021.2604, doi:10.21070/acopen.4.2021.2604.