Diener et al. https://ink.library.smu.edu.sg/cgi/viewcontent.cgi?article=1920&context=soss_research

Luhmann et al. https://pmc.ncbi.nlm.nih.gov/articles/PMC3289759/

Blanchflower & Graham https://pubmed.ncbi.nlm.nih.gov/34690403/

WHO https://www.who.int/news/item/28-05-2019-burn-out-an-occupational-phenomenon-international-classification-of-diseases