Building The Manchurian Candidate by Colin A. Ross

“By research at the medical school library, ordering out-of-print books, and requests filed through the Freedom of Information Act, I have built up compelling documentation of the fact that the CIA and military intelligence agencies have been creating multiple personality experimentally, and using these subjects in courier and infiltration operations.” Dr Colin A. Ross, M.D., 1999

Some other notable books on this topic by Dr Ross are:
Dissociative identity disorder : diagnosis, clinical features, and treatment of multiple personality
The Osiris complex : case studies in multiple personality disorder

Link to article Building The Manchurian Candidate: Deliberate Creation of Multiple Personality by Psychiatrists