PENERAPAN MODEL GROUP INVESTIGATION TERHADAP HASIL BELAJAR MATERI BAHAN KIMIA DI SMP - Dewi, Ratih Puspita; Iswari, Retno Sri; Susanti, R. (Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang in Collaboration with Perkumpulan Pendidikan IPA Indonesia, 2012)