Hatamleh, M. A. ., Eid, F. S. A. ., Abutabanjeh, A. ., Akour, A. A. A. . and Alqatami, H. M. . (2023) “The Level of Psychological Hardiness Among Volleyball and Swimming Players in Jordan: A Comparative Study”, Migration Letters. London, UK, 21(2), pp. 106–114. doi: 10.59670/ml.v21i2.5854.