For more reference works on Shakespeare, try these subject headings in SouthernSearch:
Absolute Shakespeare This is an essential resource for William Shakespeare's plays, sonnets, poems, quotes, biography, and the Globe Theatre.
Hamletworks.org Links to a large number of texts and has line by line commentary and analyses from various editions.
The Complete Works of Shakespeare A useful site that contains links to a variety of information on Shakespeare--movies, Shakespeare festivals, encyclopedia articles, on-line courses on Shakespeare, journals and texts with criticism.
Shakespeare Resource Center Contains links to Shakespeare's biography, works, synopsis of Shakespeare's plays, authorship debate, language, the Globe, Elizabethan English, and much more.
Shakespeare.Com An excellent site that is dedicated to the needs of students who may want to criticize and interpret Shakespeare's works. Also has useful tips for teachers of Shakespeare.
William Shakespeare Contains full text of Shakespeare's works.