The research process begins with the gathering of background information on your topic. Background information consists of such reference resources as specialized encyclopedias and dictionaries, handbooks, manuals, directories and guides, subject bibliographies, and statistical resources.
Dictionaries are a familiar format, with their alphabetical lists of words and definitions.
When in doubt, go to the shelf and take a look. Encyclopedias will contain articles arranged alphabetically on a wide range of subjects or on numerous aspects of a particular field. An Encyclopedia of Radio Programs. A yearbook will contain data and statistics for a given year without the additional material that may be found in an almanac. These resources provide information or instruction about a subject.