M.R., Kondubaeva, Ongarbaeva A. T., Bekalay N.K., Aubakirova A.K., Berdenova S. Sh., y Tolkinbayev A.K. 2019. «The Problem of Correctness and Reliability of the Study in Trilingual Education». Opción 34 (85-2), 517-43. https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/23806.