There are several good books readily available on Jeff Dahmer in bookstores and libraries. The Crime Library particularly recommends Anne E. Schwartz's Man Who Could Not Kill Enough; The Secret Murders of Milwaukee's Jeffrey Dahmer. As a newspaper reporter who followed the story from its very beginning to its completion, she brings an intimacy and immediacy that other books do not have. Another book that is recommended, but not easy to find, is Lionel's Dahmer's A Father's Story, which gives an intimate account of what it is like trying to raise a boy with so many serious, hidden problems.
A&E Biography Video: Jeffrey Dahmer
Baumann, Edward, Step into My Parlor: The Chilling Story of Serial Killer Jeffrey Dahmer. 1991.
Dahmer, Lionel, A Father's Story. William Morrow and Company, 1994.
Davis, Don, Milwaukee Murders, Nightmare in Apartment 213: The True Story. St Martin's Paperbacks, 1995.
Martingale, Moira, Cannibal Killers. St. Martin's Paperbacks, 1993.
Tithecott, Richard and James Kincaid, Of Men & Monsters: Jeffrey Dahmer & the Construction of the Serial Killer.