Qonita, Mirza, and Frida Ulfah Ermawati. “The Validity and Reliability of Five-Tier Conception Diagnostic Test for Vector Concepts”. IPF: Inovasi Pendidikan Fisika, vol. 9, no. 3, Aug. 2020, pp. 459-65, https://ejournal.unesa.ac.id/index.php/inovasi-pendidikan-fisika/article/view/35743.