Online and interactive version of Encyclopædia Britannica. All branches of knowledge are covered in this resource aimed at older students and adults. There is also a Teens and Kids version available.
Encyclopedias and General Resources
Online Resources
Britannica Library Adults Reference: dictionaries, encyclopedias etc
World Book Advanced Reference: dictionaries, encyclopedias etc 
Powerful reference tool for advanced research in all subject areas, contains detailed content written for secondary level students. Includes integrated research of articles, media, primary resources, eBooks, dictionary, atlas and more.
World Book Web Academic & Research
The online version of the popular encyclopedia known as World Book and a variety of other World Book resources on the one platform including World Book Kids and World Book Student for teens.