Dictionaries
- Oxford English Dictionary Online
- Merriam-Webster dictionary
- LogosDictionary (hundreds of language dictionaries to/from English)
- Merriam-Webster Visual Dictionary
Encyclopedias (General)
Encyclopedias (Subject Specific)
- Corsini Encyclopedia of Psychology
- Encyclopaedia Judaica (2007) (historical)
- Encyclopedia of American Environmental History
- Encyclopedia of Ancient History
- Encyclopedia of Religion (Macmillan, 2005)
- Encyclopedia of Special Education, 4th Ed.
- Encyclopedia of the Continental Congresses
- Gale Encyclopedia of Diets, ed. 2: A Guide to Health and Nutrition
- Gale Encyclopedia of Medicine, ed. 4
- Gale Encyclopedia of Nursing and Allied Health, 3rd ed
- Gale Encyclopedia of Science, 6th ed
- Grzimek's Animal Life Encyclopedia
- Historical Statistics of the United States: Millennial Edition
- New Catholic Encyclopedia
- Oxford Classical Dictionary, 4th edition (2012)
- Oxford International Encyclopedia of Peace
- Oxford Music Online