Eep! My source is from a book, not the Web!

One of my students asked about what to do if you find a source at the library but not online.

First of all, go you for researching at the library!

Now. As Prof. Blaine said, the point is that we would be able to find your source if need be, or if we wanted to find more information from your source. In that case, use MLA style for sourcing your book.