Arum, J. S., and N. Achmad. “The Effect of Promotion, Price and Product Quality on Wardah Skincare Purchasing Decisions”. Jurnal Ilmiah Manajemen Kesatuan, vol. 12, no. 2, Apr. 2024, pp. 451-8, https://jurnal.ibik.ac.id/index.php/jimkes/article/view/2516.