Books can go broad and deep because they are long. Use a book to get a combination of ideas, numbers, history, theory--a book can do it all. But the publication cycle can take 6 months to many years, given the time it takes to research, write, edit, publish, print and deliver books, so don't expect a book to cover the most recent ideas.
Books might be popular or scholarly, so use your critical thinking skills to evaluate books, even if you do get them from a library.
Check SEU Periodical/Magazine Holdings