Johan Yunus, M. Tauchid Noor, and Kridawati Sadhana. “Elementary School of Ecosystem-Based : Study on the Implementation of Education Policies in Elementary School of Ecosystem-Based Management State of Indonesia”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE, vol. 7, no. 4, Apr. 2021, pp. 60-72, doi:10.31695/IJASRE.2021.33999.