Summarized versions for the DSM IV-TR can be found on psychology and psychiatry specialized websites or found via PDF files for download. Some reliable websites are Psychiatry Online, Psychiatry.org and Behave.net. You can also find quick study guides and dedicated DSM IV-TR specialized manuals, full study guides and individual chapters.
As of September 2014, the DSM IV-TR has been replaced with the DSM-5 manual. These manuals update with amendments frequently. The most updated information about mental illnesses, disorders and syndromes, as well as the codes coordinating to them, can be found in the DSM-5 also available in summarized versions online.