[2] Council of Europe. Common European Framework of Reference for Languages: Learning, teaching, assessment – Companion volume, Council of Europe. Strasbourg; 2020.
[4] Specifications of the NATO STANAG 6001 Russian Language Proficiency Test for the Ministry of Defense of the Republic of Bulgaria in accordance with NATO STANAG 6001 ed. 5, 2nd revised edition. Available from: https://www.mod.bg
[5] Specifications of the NATO STANAG 6001 English Language Proficiency Test for the Ministry of Defense of the Republic of Bulgaria in accordance with NATO STANAG 6001 ed.4, 11th revised edition. Available from: https://www.mod.bg
[9] Namaziandost E., Ahmadi Sh. The Assessment of Oral Profciency through Holistic and Analytic Techniques of Scoring: A Comparative Study. Applied Linguistics Research Journal, 3 (2): 2019. doi: 10.14744/alrj.2019.83792.