A reference source (print or online) is organized for quick access (e.g., alphabetically, by date, by geographic region) to brief information, statistics or maps.

The title may include a word like:

• Almanac
• Atlas
• Dictionary
• Encyclopedia
• Factbook
• Handbook
• Quotations
• Yearbook

Tip: While it may be used for reference, a textbook is usually cited as a book.