Kartini, Kartini, Aris Doyan, Kosim Kosim, Susilawati Susilawati, Baiq Uswatul Khasanah, Syamsul Hakim, and Lalu Muliyadi. “Analysis of Validation Development Learning Model Attainment Concept to Improve Critical Thinking Skills and Student Learning Outcomes”. Jurnal Penelitian Pendidikan IPA 5, no. 2 (June 20, 2019): 185–188. Accessed April 24, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/262.