K. H. Aburto, M. M. Rioseco, and E. Moyano-Díaz, “Concept of Happiness in Adults from Low-Income Class”, Paidéia (Ribeirão Preto), vol. 27, no. Suppl. 1, pp. 386–394, Oct. 2018, doi: 10.1590/1982-432727s1201703.