Santi, Lusia, Erlina, and Rachmat Sahputra. “A Description of Formal Reasoning Ability and Its Relationship With Chemistry Learning Outcomes of Grade XI Senior High School Students”. Hydrogen: Jurnal Kependidikan Kimia 13, no. 4 (September 29, 2025). Accessed September 30, 2025. https://ojspanel.undikma.ac.id/index.php/hydrogen/article/view/17118.