Google has a vast amount of references for people to learn and read. One of my favorites would be the Google Books. There are plenty of online books for you to read on Google's website. Recently they were trying to resign deals with authors and publishers. They wanted to grow the amount of books that they have in their database. They gained a lot of books for the library, but due to some terms of the agreement there a few that fell off the band wagon. This will not allow Google to apply their book to the online reading entertainment. When you read their books that are on their site it is pulled up in a PDF like page that allows you to read but not alter. This also gives Google the chance to sell you the book and make the publisher some money for offering their book to the list. The full agreement is available to the public to read at This Site.