1. Abdollahi A, Abu Talib M, Yaacob SN, Ismail Z (2014) Hardiness as a mediator between perceived stress and happiness in nurses. J Psychiatr Ment Health Nurs 21:789–796
2. Anand S, Bärnighausen T (2012) Health workers at the core of the health system: framework and research issues. Health Policy 105:185–191
3. Appel L, Labhart L, Balczo P, Mccieary N, Raley M, Winsett RP (2013) A comparative study of a happiness intervention in medical-surgical nurses. MEDSURG Nurs 22:319–324
4. Argan M, Argan MT, Dursun MT (2018) Examining relationships among well-being, leisure satisfaction, life satisfaction, and happiness. Int J Med Res Health Sci 7:49–59
5. Argyle M, Martin M, Crossland J (1989) Happiness as a function of personality and social encounters. In Forgas JP, Innes JM (Eds.), Recent advances in social psychology: An international perspective, 189–203. North-Holland: Elsevier Science Publishers B.V.