Hatamleh, M. A. .; Eid, F. S. A. .; Abutabanjeh, A. .; Akour, A. A. A. .; Alqatami, H. M. . The Level of Psychological Hardiness Among Volleyball and Swimming Players in Jordan: A Comparative Study. Migrat. Lett. 2023, 21, 106-114.