A post recently made on the exjw reddit forum made reference to the International Cultic Association.
If you go to their webpage, http://www.icsahome.com/, and click on the "email signup", it will take you to a page where you fill out a short survey.
After you submit the survey, you are able to access free e-book downloads.
These books and resources are excellent for anyone interested in researching the psychological aspects of the tactics of high control groups and the resulting trauma that people experience from exposure to these groups.
I downloaded the following and have started reading the Margaret Singer collection.
Bardin, Livia - Coping with Cult Involvement- A Handbook for Families and Friends
Ford, Wendy - Recovery From Abusive Groups - Healing From the Trauma of Authoritarian Leaders
Giambalvo, Carol - Family Interventions for Cult-Affected Loved Ones
Rosedale, Herbert - Memorial Collection
Singer, Margaret - Memorial Collection
Rudin, Marcia R. - Cults on Campus