Kenny, L., P. Hyland, M. Cloitre, and M. Shevlin. “Factor Structure of the Shortened Six-Item Version of the De Jong Gierveld Loneliness Scale (DJGLS-6) A Systematic Review”. European Journal of Mental Health, vol. 18, Jan. 2023, e0001, pp. 1-12, doi:10.5708/EJMH.18.2023.0001.