It is a book of facts and figures, and very often on no specific topic. Dictionaries and encyclopedias are included, and they cover every topic. Thesauruses, atlases, and almanacs are in this category too.
Reference software most commonly replicates and expands upon printed document such as- dictionaries, encyclopedias, atlases and other informational sources. Reference software facilitates learning at all levels"
A reference book is a typically very large, very expensive book that is designated for "in-library" use only due to its expense. Examples of this include atlases, dictionaries, encyclopedias and bibliographies.
Books that are put in the reserve section may include: Dictionaries Thesauri Encyclopedias Yearbooks Atlases Catalogues Directories Newspapers Magazines Journals Almanacs Bibliographies Biographies Maps
Reference books cannot be borrowed from the library - they are to be used within the library only. These books usually include: encyclopedias dictionaries yearbooks atlases almanacs bibliographies directories handbooks indexes