endogenic information hub
DSM-5 - Dissociative Identity Disorder - Page 491:Dissociative Disorders

as you can see, trauma is not one of the requirements to get diagnosed with DID, and its not a trauma disorder! Its a dissociative disorder.
the DSM-5 is one of the official Diagnosis books!
kinhost - claims there is no research on endogenics
kinhost - Community Division: Endogenic vs. Traumagenic
this manual isnt specifically scientifically backed- it's experiential- although they draw from, and cite, occasional professional reference materials
academia.edu - normal dimensions of multiple personality without amnesia
A survey for distinguishing the normal and pathological dimensions of multiple personality the Personal Situations Survey (PSS)-was developed by the authors and tested on 209 college students
a tumblr account attempting to pull together references/research on endogenic folks
Power To The Plurals - Origin of Endogenic System and Traumagenic System Terminology
The Plural Association is the first and only grassroots, volunteer and peer-led nonprofit empowering Plurals
lb-lee.dreamwidth.org - Quick’N’Dirty Plural History (1811-1980ish)
This is the textual essay version of their video presentation for the Plural Positivity Conference. Most of their citations and sources for the early folks they only know about thanks to Baldwin’s Oneselves
plural events - The Potential for Non-traumagenic Systems to be Diagnosed with DID/OSDD
A discussion of what it is like living as an endogenic system while having DID, from a community standpoint, and exploration of the perception that only traumagenic systems can be diagnosed with DID/OSDD
This study was supported by the Hungarian National Research, Development and Innovation Office
frailittleworld - google doc: Scientific articles on endogenics
a google doc containing links to scientific articles on endogenic systems