Marsia Adimani Ndruru. “The Application of a Problem-Based Learning Model to Increase Student Learning Activeness on Ecosystem Material in Class X Agribusiness of Food Crops and Horticulture at State Vocational High School 1 Hilimegai in the 2022/2023 Academic Year”. Journal of Education Innovation and Curriculum Development 1, no. 3 (December 30, 2023): 75–79. Accessed May 21, 2025. https://journals.iarn.or.id/index.php/educur/article/view/240.