Here are some interesting books to read and movies to watch. They will give you a better idea of MPD. "The Three Faces of Eve" is a movie, that's a true story of Eve White who developed many different personalities. "Sybil" is also a movie made in 1976, starring Sally Fields.
-SYBIL*
-THE THREE FACES OF EVE*
-THE FIVE OF ME
-THE MINDS OF BILLY MILLIGAN
-ALL AROUND TOWN (BOOK)
* Are some of the best-known movies of Multiple Personality Disorder.