An Introduction to the Literature of the Old Testament

If you're looking for a detailed study of the documentary hypothesis (JEDP), this is one of the best classic works on the subject. It helps you understand which passages are ascribed to which source and why. Although it can be tedious, I think it hits the rather narrow middle ground between works that superficially introduce the hypothesis and ones that assume the reader already knows everything about it. The edition I have of this in my library is an older Libronix version, and the hyperlinking could be better.