Yulia, Sofiani, and Oka Kurniawan Shavab. “Kontribusi Model Pembelajaran Kooperatif Learning Tipe Group Investigation Berbantuan Learning Management System (LMS) Berbasis Edmodo Dalam Meningkatkan Kemampuan Berpikir Historis Mahasiswa Calon Guru Sejarah”. Indonesian Journal of History Education 6, no. 2 (December 10, 2018): 115-122. Accessed August 19, 2019. https://journal.unnes.ac.id/sju/index.php/ijhe/article/view/27635.