Hartono, Wahyu, Samsul Hadi, Raden Rosnawati, and Heri Retnawati. “Exploration of Diagnostic Testing Instruments: Validity, Reliability, and Item Characteristics”. Pegem Journal of Education and Instruction 13, no. 3 (July 1, 2023): 386–394. Accessed May 31, 2025. https://www.pegegog.net/index.php/pegegog/article/view/2147.