Online reference works
- Oxford Reference Online: large collection of online reference works which can be searched singly or as a group. It includes subject and language dictionaries, thesauri, Who's Whos and biographical dictionaries.
- Oxford English Dictionary (OED): the online version of the authoritative dictionary of English
- Dictionary of National Biography: the online version of the major British biographical dictionary
- Dictionary of Old English Web Corpus: online database consisting of at least one copy of every surviving Old English text, covering over 3 million words of Old English and ca 1 million words of Latin