This one is a good start, although it only touches on the structural theory of dissociation. I have to go out now, so I'll look up more later.
http://www.isst-d.org/jtd/2011AdultT...nesSummary.pdf
A quote from it:
Developmental models of DID posit that the disorder does not arise
from a previously mature, unified mind or core personality that becomes
shattered or fractured. Rather, DID results from a failure of normal developmental
integration, which is caused by overwhelming experiences and
disturbed caregiver–child interactions (including neglect and the failure
to respond) during critical early developmental periods. This, in turn,
leads some traumatized children to develop relatively discrete, personified
behavioral states or subsystems of their core personality.