The Craft of Research by
Call Number: Bass and Bass Reference, Q180.55.M4 B66X 2008
This is an enormously helpful book pitched at the perfect level of sophistication for Yale students. Especially useful is chapter 3, which discusses how to turn a general interest in a subject into a focused research question or problem. This is a crucial step in any research project and one that is often given too little thought. The link above takes you to an e-book version of the 2nd edition.