Yudina, I. A., N. V. Stepanova, and A. D. Ivanova. “The Role of Parents in the Speech Therapy Work With Early Age Children Having Delay in Speech Development in a Bilingual Environment”. Amazonia Investiga, vol. 8, no. 21, Aug. 2019, pp. 408-19, https://amazoniainvestiga.info/index.php/amazonia/article/view/119.