Use these print sources to get an overview of your topic, to find out what the major issues are, and to provide general background.
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 the UCLA Library Catalog. Here is a list of online dictionaries helpful for research in communications studies.