References

Sheldon, M. & Lyubomirsky, S. (2006) 'How to increase and sustain positive emotion: The effects of expressing gratitude and visualizing best possible selves', The Journal of Positive Psychology.

Topp C.W., Østergaard S.D., Søndergaard S. & Bech P. (2015) The WHO-5 Well-Being Index: A Systematic Review of the Literature. Psychotherapy and Psychosomatics, 84, 167-176.

World Health Organisation (1998) 'Wellbeing Measures in Primary Health Care/The Depcare Project', WHO Regional Office for Europe, Copenhagen.