Leonenko, Nataliya O., Zoya V. Lukashenya, and Evgeniya I. Ostasheva. “Psychological Characteristics of Hardiness in Russian and Belarusian Students: A Retrospective Analysis”. Psychology in Education 2, no. 4 (December 30, 2020): 321–328. Accessed November 8, 2026. https://psychinedu.ru/index.php/main/article/view/135.