Some free encyclopedias online include Encyclopedia.com, Bartleby.com and Wikipedia.org. These websites provide extensive reference work that covers different branches of knowledge to supplement printed collections.
Encyclopedia.com offers resources from published sources, such as Oxford University Press, and has up to 200,000 entries from different sources as of 2016.
Wikipedia is an open encyclopedia that is editable by any person and offers more than 35 million articles in 250 languages, with over five million articles in English. It covers different topics and categories including politics, technology, science, history and biographies.
Bartleby.com offers researchers and students access to resources and books, covering fiction and nonfiction information.