Books are the best source for indepth information when you really need to know a subject in and out. Typical books are structured in such a way as to lead you from little knowledge about a subject to a more thorough understanding; this cannot usually be said for web resources or articles.
Books can be considered scholarly sources, but remember, they do not always contain the most current research on a topic (refer to the Information Cycle Timeline). For this, you may need to locate research journal articles on your topic. You may find books by searching the Library's Catalog.
