| Dictionaries | Encyclopaedias | Thesauri | ||
|---|---|---|---|---|
| OED | Encyclopaedia.com | Thesaurus.com | ||
| (via Athens) | ||||
| Encyclopædia Britannica (current) | Roget | |||
| Ask Oxford | 1911 ed. (Lovetoknow) | |||
| Reference.com | Encyclopedia of Mental Disorders | Wikipedia | ||
| List of online encyclopaedias | ||||
| Wiktionary | Encyclopedia of the Nations | Online music and lyrics databases | ||
| Urban Dictionary | Small Business Encyclopedia Reference of Small Business |
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| Encyclopedia Mythica | ||||
| Catholic Encyclopedia | ||||
| Everything2.com | ||||
| CIA World Factbook | ||||
| Languages |