“Analysis of the Application of the Project-Based Learning Model in Improving the Mutual Cooperation Attitude of Primary School Students: Analisis Penerapan Model Pembelajaran Berbasis Proyek Dalam Meningkatkan Sikap Gotong Royong Siswa Sekolah Dasar”. 2026. Indonesian Journal of Education Methods Development 21 (1): 10.21070/ijemd.v21i1.1090. https://doi.org/10.21070/ijemd.v21i1.1090.