A-Z Resource List: O

OpenDissertations is an open-access database built to assist researchers in locating both historic and contemporary dissertations and theses. It incorporates EBSCO’s previously released American Doctoral Dissertations, and features additional dissertation metadata contributed by select colleges and universities from around the world. Providing researchers with citations to graduate research from the early 20th century to the present, this database will continue to grow through regular updates and new partnerships with graduate degree-granting institutions.

Textbooks in the Open Textbook Library are considered open because they are free to use and distribute, and are licensed to be freely adapted or changed with proper attribution.

The Oxford English Dictionary is the accepted authority on the evolution of the English language over the last millennium. It is an unsurpassed guide to the meaning, history, and pronunciation of over half a million words, both present and past. It traces the usage of words through 2.5 million quotations from a wide range of international English language sources, from classic literature and specialist periodicals to film scripts and cookery books.

Oxford Music Online is the gateway offering users the ability to access and cross-search multiple music reference resources in one location. With Grove Music Online as its cornerstone, Oxford Music Online also contains The Oxford Companion to Music (revised 2011), which offers more than 8,000 articles on composers, performers, conductors, instruments and notation, forms and genres, and individual works; and The Oxford Dictionary of Music,6th edition, which supplements Grove's more-extensive articles with content geared toward undergraduates and general users.

Oxford Scholarship Online offers access to thousands of academic works from the celebrated scholarly list of Oxford University Press, covering subjects across the humanities, social sciences, sciences, medicine, and law.