- Medical News Today 09/07/2017: What is the link between love and oxytocin?
- Psychology Today: What Is Oxytocin?
- Wikipedia: Oxytocin
- HuffPost 08/07/2016: The Spellbinding Bond To Narcissists And Psychopaths – What's Happening In The Brain?
- NCBI: "The role of oxytocin in psychiatric disorders: A review of biological and therapeutic research findings"
- Science Daily 06/19/2013: Altered brain structure in pathological narcissism
- PsychCentral 08/08/2018: Oxytocin Fuels Distinction of Self & Others
- LiveScience 06/24/2013: Narcissists' Lack of Empathy Detected in Brain Scans
That's enough for now. There's plenty more to find.