The Encyclopedia Herald of Ukraine,
2014, Volume 4-5, pp. 5-12
Mykola Zhelezniak . "Words on the Mentor." The Encyclopedia Herald of Ukraine, 2014, http://evu.encyclopedia.kiev.ua/en/vol-4-5/words-on-the-mentor/.
2014-10-30
The Encyclopedia Herald of Ukraine,
2014, Volume 4-5, pp. 5-12