Printed book
From ComputerCraft Wiki
The printed book is an item consisting of more than one printed page bound with a leather cover. The book can be viewed by right clicking with it on the hotbar. While being viewed, the mouse scroll wheel or left/right arrow keys can be used to move between pages.
Crafting
The printed book can be crafted with a string, a piece of leather, and the pages to combine, either as multiple individual printed pages, at least one already combined printed pages, or a combination of the two. The order of the pages in the book is determined by the order the pages are arranged in in the crafting grid, from left to right then top to bottom. The position of the string and leather in the crafting grid does not matter, nor does the exact position of the pages.