Janina Fisher extends the concept of plurality focused communication in her book really well too, which is a modified version of IFS tweaked with empirical evid

Janina Fisher extends the concept of plurality focused communication in her book really well too, which is a modified version of IFS tweaked with empirical evidence over the years. TBKTS is really good but the anecdotes can be retraumatizing for many, so I just recommend "Healing the Fragmented Selves of Trauma Survivors" as a good starter. Works always from PTSD through DID, which is a great range! :D