Badakhshan Toroghi, Esmat, Mahboobeh Soleimanpour Omran, and Rokhsareh Fazlli. 2022. “Validation of a Model for the Quality of Education in Multi-Grade Classrooms in Primary Schools”. Iranian Journal of Educational Sociology 5 (4): 43-54. https://qijes.com/index.php/ijes/article/view/1104.