Shakespearean Criticism : Excerpts from the Criticism of William Shakespeare's Plays and Poetry, From the First Published Appraisals to Current Evaluations - Humanities Reference PR 2965 .S43
A great source.Indexes are especially good: you can look up a theme, a motif, to learn where it's been treated in relation to a play, character, etc. Or, you can begin with a play, a specific character, and see the connections with theme and/or motif. Articles/essays (written by noteworthy, even famous critics/ contemporaries) are arranged in chronological order revealing trends in criticism over the life of the author/work. Full text.