Reference books are a very good place to start your research. Encyclopedia's and subject encyclopedias' will provide good background information on your topic and will identify other important concepts, people, places and terms that can help you further your research in the article databases.
All academic libraries will use the Library of Congress Classification System to organize their collection. A Library of Congress call number is given and placed on the spine of every item in the library.
Library of Congress call numbers for Speech and Communication:
P87-96 Communication. Mass media
P94.7 Interpersonal communication
P95-95.6 Oral communication. Speech