Sagala W, Chastanti I, Harahap DA. The Profile of Using Grass Field as a Learning Resource on Ecosystem Materials. jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2021 Mar. 31 [cited 2024 Nov. 23];7(2):143-8. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/584