Díaz Morales JF, Sánchez-lópez MP. Composite and Preferences Scales of Morningness: Reliability and Factor Invariance in Adult and University Samples. Span. j. psychol. 2004;7(2):93-100. Accessed July 22, 2026. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0404220093A