Sari, Ira Widya, et al. “Perceived Organizational Support and Work Spirit As Predictors of Workplace Happiness: The Mediating Role of Employee Engagement Among Public Hospital Nurses”. Indonesian Journal Economic Review (IJER), vol. 6, no. 2, June 2026, pp. 932-44, https://doi.org/10.59431/ijer.v6i2.872.