**NO PURCHASE NECESSARY. Offer expires on 8/17/2020  at 11:59 PM. It is valid in the United States only, and limited to one ebook to each of the first 350 instructors at accredited US colleges who are considering the book for course adoption. All sample copies are given at the discretion of HarperCollins. Those who request will receive a download code and instructions by 8/19/2020.