Khoirina Badriyah, and Halimatus Sa’diyah. “Calibration of Scientific Educational Research Instruments Qualitative and Quantitative Approaches”. Amandemen: Journal of Learning, Teaching and Educational Studies 3, no. 1 (May 12, 2025): 25–34. Accessed September 11, 2025. https://amandemen.my.id/index.php/i/article/view/76.