Saepuzaman, Duden, Edi Istiyono, Haryanto, and Heri Retnawati. “Characteristics of Two-Tier Multiple Choice (TTMC) High Order Thinking Skill (HOTS) Instruments and the Estimation of HOTS Abilities of Vocational Education Students Using the Item Response Theory Approach”. Journal of Engineering Education Transformations 38, no. 3 (June 3, 2025): 13–22. Accessed July 9, 2025. https://journaleet.in/index.php/jeet/article/view/2227.