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Perera, C. J. and Sumintono, B. and Jiang, N. (2018) The psychometric validation of the principal practices questionnaire based on item response theory / Corinne Jacqueline Perera, Bambang Sumintono, Jiang Na. International Online Journal of Educational Leadership, 2 (1). pp. 21-38. ISSN 2590-4159,