Simangunsong, Elfrida Br, and Suhardi Suhardi. “The Influence of Product Quality and Word of Mouth on Wardah Cosmetics Purchase Decisions in Batam City”. eCo-Buss 6, no. 1 (August 10, 2023): 418–430. Accessed March 19, 2025. https://jurnal.kdi.or.id/index.php/eb/article/view/489.