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. jeicud [Internet]. 2023 Dec. 30 [cited 2025 May 21];1(3):75-9. Available from: https://journals.iarn.or.id/index.php/educur/article/view/240