We released the fifth edition of our book Advanced Swift a few days ago. The hardcover print edition is printed and sold by Amazon (amazon.com, amazon.co.uk, amazon.de). We also increased the page size from 15×23 cm (6×9 in) to 18×25 cm (7×10 in) to keep the page count manageable (Amazon’s print on demand service limits hardcover books to 550 pages).