1.
Sitanggang HM, Lumbanraja EA. Student Cognitive Correlation of Concern for the Surrounding Natural Environment . jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2023 Aug. 25 [cited 2024 Nov. 24];9(8):6742-67. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/4977