Offer expires on 9/20/2018 at 11:59 PM. It is non-transferable, valid in the United States only, and limited to one (1) download code for (1) e-book or paperback to the first 150 qualified responders. Multiple entries will be deleted. Please note: e-book download codes will be sent to institutional email addresses only. Paperback copies will be mailed to institutional addresses only. Please check to ensure accuracy. Entries containing non-institutional email or physical addresses will be deleted.