Belen, H. and Yildirim, M. (2020) “Psychometric Analysis of Inflexibility of Happiness in Undergraduate Students: A Reliability and Validity Study”, Journal of Positive School Psychology , 4(1), pp. 69-78. Available at: http://journalppw.com/index.php/JPPW/article/view/211 (Accessed: 15August2020).