Below are links to online reference sources and collections that are most useful for this subject:
Reference sources can include encyclopedias, bibliographies, dictionaries, handbooks, and atlases.
You can find the Library's collection of reference books on Floor 1 of Frost. We also have many online databases that include collections of edited scholarly encyclopedias, dictionaries, and other reference sources.
The video below, "5 Reasons to Use Reference Sources," from the University of Guelph Library, offers additional tips to help you use these tools.