Suslova, G.     ICAO standards and recommended practices concerning language proficiency requirements [Текст] / G. Suslova, A. Gudmanian, O. Zhuravliova // Proceedings of the Second World Congress "Aviation in the X X I-st Century" "Safety in Aviation", September 19-21, 2005 / International Civil Aviation Organization; Ministry of Education and Science of Ukraine; National Academy of Sciences of Ukraine; National Aviation University. — Kyiv : NAU, 2005. — P. 6.54-6.61.