The Folger Shakespeare Library in Washington, DC, provides electronic editions of Shakespeare's plays and poems that you can read online and download free of charge. You can also use this tool to search for words, phrases, or lines in all of the texts at once. Note that this free online version does not include the notes that are included in the print copies of the Folger editions.
Shakespeare Quarterly is a scholarly journal devoted entirely to Shakespeare studies.
In both databases you can use the advanced search function to perform a search for articles published in this journal only.
The Understanding Series tool from JSTOR links each line of Shakespeare's texts to journal articles and ebooks in JSTOR that cite that line. If a particular line or passage is central to your analysis, you can use this tool to find out what others are saying about it.
Shakespeare is famous for his word play. You can log on to the electronic version of the Oxford English Dictionary (OED) to look up words used in Shakespeare's texts and find out what meaning or meanings they may have had during his time. Note that the meanings of a word today might be very different from the meanings it held in sixteenth- and seventeenth-century England.
Click here to learn more about the history of the OED.
You can find the 20-volume 2nd edition of the OED in the Reference Section on Floor B2 of Cooperman library, with call number PE 1625 .O87 1989