Orekhova, Y. Y., Grebenkina L. К., M. V. Badelina, et Kopylova N. А. « Volunteering As a Means of Formation of Professional Competency of Future Specialists ». Amazonia Investiga, vol. 8, nᵒ 19, avril 2019, p. 316-24, https://amazoniainvestiga.info/index.php/amazonia/article/view/233.