Akmal AU, Festiyed. Development of Contextual Teaching and Learning-Based Test Instruments to Improve 21st Century Skills in Students. jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2023 Jul. 25 [cited 2024 Nov. 25];9(7):5097-102. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/4191