Johan Yunus, M. Tauchid Noor and Kridawati Sadhana (2021) “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, 7(4), pp. 60–72. doi: 10.31695/IJASRE.2021.33999.