Saputri, Aprilia Eki. “The DEVELOPMENT PRINCIPLE OF A CONTEXTUAL BASED TEACHING BOOK ON ENVIRONMENTAL EDUCATION FOR PRIMARY SCHOOL TEACHERS”. Jurnal Ilmiah Pendidikan Lingkungan dan Pembangunan 22, no. 01 (August 2, 2021): 43 - 49. Accessed April 26, 2024. https://journal.unj.ac.id/unj/index.php/plpb/article/view/16966.