By Arifin, Moch. Bahak Udin, and Nurdyansyah. “Buku Ajar Metodologi Penelitian Pendidikan”. Umsida Press (August 7, 2018): 1-143. Accessed June 18, 2024. https://press.umsida.ac.id/index.php/umsidapress/article/view/978-602-5914-19-5.