Setya Negara, Ade Irma, Destiana Tunggal Pramesti, and Muhammad Sodikun. “Green Marketing in Sustainable Business: Utilizing Fly Ash As a Cement Substitute to Reduce CO2 Emissions in the Mortar Industry”. Open Access Indonesia Journal of Social Sciences 7, no. 2 (December 27, 2023): 1398-1404. Accessed September 8, 2024. https://journalsocialsciences.com/index.php/oaijss/article/view/223.