Pebrianti, Aneu, Sufyani Prabawanto, and Elah Nurlaelah. “How Do Students Solve Reversible Thinking Problems in Mathematics?”. Jurnal Elemen 9, no. 2 (July 31, 2023): 630–643. Accessed May 20, 2024. https://e-journal.hamzanwadi.ac.id/index.php/jel/article/view/17821.