Salsabila, Fadhilah Nur, and Frida Ulfah Ermawati. 2020. “Validity and Reliability of Conception Diagnostic Test Using Five-Tier Format for Elasticity Concepts”. IPF: Inovasi Pendidikan Fisika 9 (3):439-46. https://ejournal.unesa.ac.id/index.php/inovasi-pendidikan-fisika/article/view/35747.