Vaganova, Olga I., Irina N. Odarich, Ol'ga A. Rudakova, Julia S. Volkova, y Marina N. Bulaeva. «Level Differentiation Technology in Vocational Education». Amazonia Investiga 9, no. 28 (abril 21, 2020): 42–49. Accedido noviembre 20, 2025. https://www.amazoniainvestiga.info/index.php/amazonia/article/view/1279.