Hatmayanti, Y. et al. 2018. KEEFEKTIFAN MODEL NUMBERED HEAD TOGETHER BERBANTU MEDIA PUZZLE TERHADAP HASIL BELAJAR METAMORFOSIS SISWA KELAS IV SD. JS (JURNAL SEKOLAH). 2, 3 (Jun. 2018), 226–230. DOI:https://doi.org/10.24114/js.v2i3.9921.