Aljubaily, Hesham Yahya Ali. “Using the Graded Response Model to Validate and Standardize the Academic Self Concept Scale for University Students in Saudi Arabia”. Journal of Ecohumanism 4, no. 1 (January 23, 2025): 2001 –. Accessed May 30, 2025. https://ecohumanism.co.uk/joe/ecohumanism/article/view/6020.