Kotlovskiy, A., N. Mykytenko, A. Onufriv, and M. Salamakha. “LANGUAGE PORTFOLIO FOR BUILDING LINGUISTIC COMPETENCE IN ESP SPEAKING IN STUDENTS’ INDEPENDENT WORK”. Advanced Education, vol. 7, no. 15, July 2020, pp. 20-24, doi:10.20535/2410-8286.200750.