“Factor Structure of the Shortened Six-Item Version of the De Jong Gierveld Loneliness Scale (DJGLS-6). A Systematic Review and Testing Factor Models in a Nationally Representative Sample”. European Journal of Mental Health 18 (January 25, 2023): 1–12. Accessed December 6, 2025. https://ejmh.semmelweis.hu/test/index.php/ejmh/article/view/261.