I was looking for the textbook. The Amazon site lists "hardcover" and "paperback" versions. The paperback version is significantly less expensive. So I ordered the paperback version. It turned out that this "paperback" version is actually not the textbook itself, but the workbook for the textbook. Yet on the Amazon website, it is simply listed as "paperback" together with "hardcover" version. This is misleading at best and cheating in reality. The Amazon site should specifically indicate that this is the workbook, not the textbook.