This video demonstrates a simple and functional 10-minute slipcase. My advice on how to measure the width of the book is not perfect. For most books with a rounded spine, measure the width from the fore-edge side of the boards to the shoulder of the book, not the outside of the spine. If it is a square-back books it's much the same thing. But for a rounded book if you go to the outside of the spine the slip case will extend past the shoulder and be unsupported by the book and likely to get damaged.