E-book promo: In order to receive the 50 % e-book promo you need to finalize the purchase of either the Hardcover book or Paperback book. Once you have paid for the book, please send us a mail to, requesting the coupon code for this promotion. Please make sure you send us your name and shipping address you used for the book puchase, in order for us to verify your purchase. With the coupon code you can go back to the shop and you will receive the 50 % discount at checkout. Thank you.