Cristina Sanchez-Sanchez,  Moving towards a General Definition of Public Happiness: A Grounded Theory Approach to the Recent Academic Research on Well-Being.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2017, vol. 127(7). 1880 - 1895
    [viewed 09 December 2021]. Available from: https://publications.waset.org/pdf/10007549.