According to The Times, the Oxford English Dictionary is "the ultimate authority on the English language as well as a history of English speech and thought from its infancy to the present day". It is a unique source of scholarly information on the meaning, history and pronunciation of words both past and present.
The Modern Language Association's bibliographic index of literature, languages, linguistics, and folklore from journals and series published worldwide. It indexes books, essay collections, working papers, proceedings, dissertations, and bibliographies. It contains in each record a bibliographic citation for a journal article, book, or other item including information about the libraries that own the library resources. It now includes the MLA Directory of Periodicals, which provides full information on more than 4,000 journals and series in the MLA International Bibliography Master List of Periodicals. The Directory of Periodicals includes many of the periodicals that are indexed in the MLA International Bibliography database. The electronic Directory of Periodicals is updated every six months.