The new edition of the DSM-5 is now available via PsychiatryOnline.
Also, use Orbis to find the online book or the print copy in the Medical Library.
The Medical Library has a print copy in the Reserve Room Ref 21 RC455.2 C4 D536 2013. The Yale School of Nursing also has a copy in the Commons for nursing students shelved under RC455.2 C4 D536 2013.
If you need assistance locating or using DSM-5, please contact your personal or liaison librarian.