@book{DouglasAdams,
  title={The Hitchhiker's Guide to the Galaxy},
  author={Adams, Douglas},
  isbn={9781417642595},
  url={http://books.google.com/books?id=W-xMPgAACAAJ},
  year={1995},
  publisher={San Val}
}

@book{Tolkien,
  title={The Hobbit},
  author={Tolkien, J. R. R.},
  year={1904?}
}