Robert Falconer has recently released his book "The Others Within Us : Internal Family Systems, Porous Mind and Spirit Posession" 

https://www.amazon.com/Others-Within-Us-Internal-Possession/dp/B0CX9L6D1B

Robert's work focuses on "Unattached Burdens", which is the Internal Family Systems term for etheric entities that inhabit the body, which are not part of the self and which Robert's work focuses upon clearing from people.