isbnLookup.js

function isbnLookup(id) {
  var url = "https://www.googleapis.com/books/v1/volumes?country=US&q=isbn:"+id;
  var options = {contentType : "application/json"};
  var resp = UrlFetchApp.fetch(url, options);
  if (resp == null || resp == "") return "N/A";
  var respdata = JSON.parse(resp.getContentText());
  if (respdata["items"].length == 0) return "Not found";
  return respdata["items"][0]["volumeInfo"]["title"];
}