These provide facts or background material that can aid in your research or refinement of your topic.

Dictionaries – a reference source in print or electronic form containing words usually alphabetically arranged along with information about their forms, pronunciations, functions, etymologies, meanings, and syntactic and idiomatic uses

Encyclopedias – a work that contains information on all branches of knowledge or treats comprehensively a particular branch of knowledge usually in articles arranged alphabetically often by subject

Geographical Sources – It is a source of information which provide information about place such as cities, town ,lakes, river, forests etc.

Yearbooks and Almanacs – are annual compendium of dates and statistics of a given year, while almanacs are annual publication of statistics and other information of the previous years.

Handbooks / Manuals – A handbook contains facts about a specific subject or instructions that can be used to accomplish something

Indexes - are compilations on information, generally arranged either alphabetically or numerically, that indicate the location of related information either within or outside of the same resource.