Encyclopedias
Britannica
Encyclopedia
HQ: Chicago, USA
A trusted source of information and knowledge for over 250 years.
Citizendium
Online encyclopedia
HQ: San Francisco, USA
A wiki-based encyclopedia that aims to improve the reliability of information.
Encyclopedia.com
Online encyclopedia
HQ: New York, USA
A comprehensive online resource for articles and information.
Scholarpedia
Collaborative encyclopedia
HQ: New York, USA
A peer-reviewed open-access encyclopedia written by scholars.
WikiPedia
Online encyclopedia
HQ: San Francisco, USA
A free online encyclopedia with articles written collaboratively by volunteers.
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