Asimov's Guide to Shakespeare, Vols. 1-2 - Isaac Asimov, Rafael Palacios It proves that he couldn't only write good and solid SF, but he was also an astounding expert on Shakespeare. I'm trying to get my hands on the digital version of these books, but to no avail. Still, it's still one of my personal references on Shakespeare on paper (along with "Shakespeare After All" by Marjorie Garber - this one I've got in digital form...).