Walter Rudin's Principles of Mathematical
Analysis is a more advanced book on real analysis. It covers the
ideas of limits, continuity, differentiation, and integration with more
advanced results and less explanation. Rudin does not, however, cover
complex analysis. The real analysis is done in the abstract perspective
of metric spaces. After preparation with Real and Complex Analysis,
you will be prepared to study baby Rudin.
Walter Rudin's Real and Complex Analysis is at a higher level. Rudin immediately begins with the abstract Lebesgue integral, the most important and an extremely powerful integration process. The only prerequisites, however, are a knowledge of basic real analysis that you will mostly have gained from Real and Complex Analysis (not Rudin's book). He does use the idea of a metric space, which you will need to study from another source, like Rudin's first book above.
We also encourage you to read the following mathematical articles, which are all relevant to analysis. You can find them through JSTOR or at your college library. (Drew students can login here to JSTOR.)