An Encyclopedia Books are a reference work or compendium providing summaries of knowledge either from all branches or from a particular field or discipline. Encyclopedias are divided into articles or entries that are often arranged alphabetically by article name and sometimes by thematic categories. It is 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. The offered Books are very important and made for use in various institutions. The Encyclopedia Books are very useful and help in providing the needed information.