1. Horn, M., Staker, H., Christensen, C.. Blended: Using Disruptive Innovations to Improve Schools. 2015. URL: https://www.amazon.com/Blended-Disruptive-Innovation-Improve-Schools/dp/1118955153. 2. Lovianova, I., Vlasenko, K., Sitak, I., Akulenko, I., Kondratyeva, O.. Model of the On-Line Course for Training Master Students Majoring in Mathematics for Teaching at University. Universal Journal of Educational Research. 2020. Vol. 8. No. 9. Pp. 3883 – 3894. URL: https://doi.org/10.13189/ujer.2020.080912.