Subject encyclopedias are encyclopedias that cover a particular area like communication or psychology. These can be useful starting points to help you narrow down your topic, get background information and overviews on your topic, and further sources in the bibliographies of each article.
Here are a few recommendations -- check the catalog and the reference section on Library North 2 for more.
If GSU's library doesn't have what you need, you have, don't give up. There are several options to get the book you want:
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You may reproduce any part of it for noncommercial purposes as long as credit is included. I encourage you to license your derivative works under Creative Commons as well to encourage sharing and reuse of educational materials.