Widhigdo, Jessica Christina, Joshua Michael Ahuluheluw, and Lena Nessyana Pandjaitan. 2020. “The Hardiness Training to Improve Psychological Well-Being of the Members of Student Organization at Universitas Surabaya”. Jurnal Psikologi Ulayat 7 (2):122-39. https://doi.org/10.24854/jpu104.