SHAH, Rikhavbhai. Educational research in classrooms and schools: A manual of materials and methods. Vidyapith (વિદ્યાપીઠ), [S. l.], v. 23, n. 5, p. 58, 1985. Disponível em: https://journal.gujaratvidyapith.org/index.php/vp/article/view/986. Acesso em: 21 oct. 2026.