Kamtsios, Spiridon, and Evangelia Karagiannopoulou. “Validation of a Newly Developed Instrument Establishing Links Between Motivation and Academic Hardiness”. Europe’s Journal of Psychology 12, no. 1 (February 29, 2016): Article e997. Accessed June 3, 2026. https://ejop.psychopen.eu/index.php/ejop/article/view/997.