Hicham Ouakil, Lakhal Tarik, Hicham El Ouazzani, and Abdelhamid Moustabchir. “Understanding the Role of Income in Personal Happiness: A Comprehensive PSM Analysis in the United States”. The Pakistan Development Review 63, no. 3 (October 21, 2024): 399–416. Accessed February 6, 2025. https://thepdr.pk/index.php/pdr/article/view/3333.