Okan M, Lu CX, Ros-García L, Hernandez WA. Stacked Generalization Model for Predicting Happiness: Positive Affect, Gratitude, Social Connectedness, and Psychological Flexibility. JARAC. 2026;8(3):1-10. Accessed July 24, 2026. https://www.journals.kmanpub.com/index.php/jarac/article/view/207