Andini, K.P. and Supriyadi 2026. 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. Indonesian Journal of Education Methods Development. 21, 1 (Sep. 2026), 10.21070/ijemd.v21i1.1090. DOI:https://doi.org/10.21070/ijemd.v21i1.1090.