code: def display_google_book(id, page=None, width=700, height=500, **kwargs):
      
      if isinstance(page, int):
          url = 'http://books.google.co.uk/books?id={id}&pg=PA{page}&output=embed'.format(id=id, page=page)
      else:
          url = 'http://books.google.co.uk/books?id={id}&pg={page}&output=embed'.format(id=id, page=page)
      display_iframe_url(url, width=width, height=height, **kwargs)
docs: Display an embedded version of a Google book.
      :param id: the id of the google book to display.
      :type id: string
      :param page: the start page for the book.
      :type id: string or int.