Perfect binding provides a result similar to that of a paperback book. The phone directory on your desktop is a common example. National Geographic would be another. At our printing firm, we get many requests to bind software manuals, instruction manuals, and many varieties of soft-covered books using perfect binding. We print the heavy-duty covers separately and attach them at the spine with a strong, flexible glue. We then trim the books on three sides to make them look clean and professional.