Why can't I find sources!?!?

March 27, 2007 6:14pm CST
I am currently writing a comparitive research essay on Imagery in Hamlet, Henry IV, and As You Like It and I cannot seem to find any sourses on the subject. WHY NOT?!?! My University has a large library but I can't find any books on the subject. I am aloud some journal and one internet source but the majority has to be text. I am getting so frusterated!!
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