Arroyo Moya L, Santiago Duque C, Troncoso Mendoza B, Troncoso Palacio A. Measurement and Improvement of the happiness. Case Study: Engineering Projects Employees. IJMSOR [Internet]. 27Apr.2019 [cited 15May2026];4(1). Available from: https://ijmsoridi.com/index.php/ijmsor/article/view/101