Ковтун, О.В. et al. 2021. SOCIOLINGUISTIC AND EDUCATIONAL ANALYSIS OF LANGUAGE PROFICIENCY OF ACTIVE OPERATIONAL PROFESSIONALS AND AB INITIO STUDENTS IN AVIATION. Proceedings of Kyiv Aviation Institute. Series: Pedagogy. Psychology. 18 (June 2021), 66–76. DOI:https://doi.org/10.18372/2411-264X.18.15476.