Nurhidayat, A. “Evaluation of Instruments on Online Self-Directed Learning Methods in Secondary Schools Using the Rasch Model”. Jurnal Multidisiplin Sahombu, vol. 5, no. 08, Dec. 2025, pp. 2848-55, https://ejournal.seaninstitute.or.id/index.php/JMS/article/view/7849.