How to buy
Pdf and epub files
After chosing the product, you will be transfered to the purchase page. After completing your order, do not close the tab or the browser, because the pdf will automatically download to your computer, tablet, or phone. In the rare event that you lose your internet connection before the file is fully downloaded, you can contact us at the next link, contact, and we will email you a copy of the file.
You can download samples below. Please note that links in the epub file that point to parts (chapters, equations, etc.) of the book not included in the sample will not work.
Hardcover books and merchandising
After chosing the product, you will be transfered to the purchase page. After completing your order, we will ship the product to the address provided. Products are manufactured and shipped after purchase. Delivery times vary by product and region. Average times are 3 days for print production and packaging and then 7 days for shipping.
Returns and refunds
Check our policies in the link below.