Praptono, Elite Perdana, Fajar Pasaribu, Hazmanan Khair, Widya Astuti, and Sri Rahayu. “Marketing Strategy for Indonesian Natural Stone Based on Digital Certificate of Authenticity (COA): Systematic Literature Review”. Proceeding of International Conference Technology, Economics, and Social Science 1, no. 1 (January 25, 2026): 744-748. Accessed October 7, 2026. https://journals.adaresearch.or.id/ictess/article/view/130.