Zacepin, Ph. D. Mikhail N., Ph. D. Anna V. Gubareva, y Ph. D. Kseniya E. Kovalenko. 2017. Continuous General Theoretical Training of Students in Conditions of Multilevel Education. Revista Conrado 13 (60), 180-83. https://conrado.ucf.edu.cu/index.php/conrado/article/view/593.