function handleResponse(response) {
      for (var i = 0; i < response.items.length; i++) {
        var item = response.items[i];
        var ebook = item.saleInfo.isEbook;
        var eisbn = item.id;
        var etitle = item.volumeInfo.title;
        ethumb = item.volumeInfo.imageLinks.thumbnail;
      }
    }