Sõrmus, M., Radišić, J., Leijen, Äli and Uibu, K. 2026. Learning motivation in the context of mathematics among 6-13-year-old students: A systematic literature review of concepts and instruments. Eesti Haridusteaduste Ajakiri. Estonian Journal of Education. 14, 1 (Apr. 2026), 139–166. DOI:https://doi.org/10.12697/eha.2026.14.1.06.