What is Reference
Reference books such as encyclopedias, dictionaries, and handbooks help you find factual and background information about your topic. It is advisable to look at more than one source of information to get the most information and to have a more balanced view of the topic.
Why Using Reference
Google and Wikipedia could be good places to start your search for general and initial ideas about your topic.
But you will always have to use Library resources to get more credible information.