Pretest-Posttest Control Group Design of Discovery Learning-Based Content Learning System in The Materials of Atomic Structure and Periodic Elements System of Class X Vocational Schools To Improve High-Level Thinking Ability. EKSAKTA [Internet]. 2023 May 22 [cited 2026 Aug. 10];22(4). Available from: https://eksakta.ppj.unp.ac.id/index.php/eksakta/article/view/268