Winarni, W. 2019. Peningkatan Prestasi Belajar IPA Materi Kalor Melalui Model Group Investigation Pada Siswa Kelas VII. Education Journal : Journal Educational Research and Development. 3, 2 (Aug. 2019), 171–182. DOI:https://doi.org/10.31537/ej.v3i2.223.