UPAYA MENINGKATKAN HASIL BELAJAR IPA MELALUI PEMBELAJARAN KOOPERATIF TIPE STAD DI SMPN 239 JAKARTA . JPMIPA [Internet]. 2014 Oct. 20 [cited 2026 Jul. 1];19(2):224-32. Available from: https://ejournal-science.upi.edu/jpmipa/article/view/654