kaynaklar : 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3150158/https://www.verywellmind.com/how-bad-relationships-affect-your-health-2223881https://multiyasam.com/serotonin-nedir-serotonin-dogal-yollarla-nasil-artirilir/http://www.hurriyet.com.tr/galeri-serotonin-salgilamaniza-yardimci-olan-6-sey-40544682?p=5https://www.businessinsider.com/why-loneliness-bad-brain-body-what-to-do-2018-5https://sinirbilim.org/endorfin-bir-mutluluk-hormonu/https://www.denizfeneri.org.tr/kurumsal/iyilik-yapma-psikolojisi_78/https://www.youtube.com/watch?v=FA1qgXovaxU