The Charles E. Young Research Library holds a large selection of print and electronic reference resources for literary research, including encyclopedias, historical and biographical dictionaries, bibliographies, online databases, and more.
Access to the DSM-5 is provided by the UCLA Library.
The DSM Library includes:
Previous versions of the DSM can be found HERE.
The UCLA Library has dictionaries of all kinds, ranging from the familiar look-up-a-word type like the Oxford English Dictionary or Merriam-Webster's Collegiate Dictionary to very specialized dictionaries for particular fields. You can find these dictionaries in UC Library Search. Here is a brief list of general dictionaries for literary research.
If there is a particular dictionary you would like me to add here, let me know.