Питель, О. “THE AB INITIUAL AIR TRAFFIC CONTROLLERS CABABILITY FOR MAINTAINING RADIOTELEPHONY USING THE ENGLISH LANGUAGE”. Proceedings of National Aviation University (archive) 47, no. 2 (March 19, 2012): 188–192. Accessed April 29, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/36.