Reference information sources can be helpful when beginning the research process. They can give you a working knowledge of your chosen subject area.
Dictionaries provide word definitions and other information about words. There are many other types of dictionaries.
Encyclopedias provide brief articles explaining a topic. There are general encyclopedias like the Encyclopedia Britannica. There are also subject-specific encyclopedias that provide detailed, advanced and technical content in a particular area of study.
Biographical resources contain information about the lives and accomplishments of notable people in various fields of achievement or areas of study.
Handbooks and Guides
Handbooks and Guides contain detailed, advanced information about a particular subject area. This can include facts about a subject or instructions for operating a device or completing a procedure.