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 list of those sources.
Dictionaries, encyclopedias, and handbooks are good background information sources.
Here are two links to Encyclopedias and Dictionaries:
We will be using Analiese's attention span topic
Chapter 22 talks about Multitasking and Attention Implications for College Students