Background information sources can help you narrow down your topic.
They will define terms you may not be familiar with.
They will provide a list of references that can help you to further explore your topics.
The experts who wrote the entries may even provide their contact information
Finding Background Information Sources
Use the library system to locate good background sources. For example a search like "Psychology" AND "Dictionary" or "Psychology" AND "Encyclopedia" will give you a listof those sources.
Here are two links to Encyclopedias and Dictionaries: