A. Yudiarso, I. W. Ardhiani, R. Surya, F. Y. Watimena, and M. Kanzaki, “Psychometric properties of the 18-item Indonesian Mental Toughness Questionnaire using the Rasch model and Machine Learning”, Psikohumaniora J. Penelit. Psikol., vol. 10, no. 1, May 2025.