Helda Yanti, Suandi Sidauruk, and Nopriawan Berkat Asi. “Students’ Difficulties in Understanding the Concept of Determining Reaction Enthalpy Changes in Grade XI-MIPA Senior High School for the 2022/2023 Academic Year Using Diagnostic Essay Tests”. Jurnal Ilmiah Kanderang Tingang 15, no. 2 (December 31, 2024): 443-450. Accessed August 26, 2025. https://www.chem-upr.education/ojs/index.php/JIKT/article/view/227.