The manufacturer of the Nuvan ProStrips advises against cutting the strips. We recommend that you do not overly pack bags/containers/totes too full with belongings so that the vapors can work around the items effectively. The bags can use a strip but must be tied to enclose the strip for effectiveness. You can apply a strip one per 100-200 cubic feet of space for 2 weeks to 4 months depending on the targeted pest.
Nuvan ProStrips do work well to kill any insects including bedbugs within electronics or items you can't put in a dryer or treat with chemicals like shoes, books, etc. You would need to put the strip in with the item and leave it in an air tight container completely sealed for 2-4 weeks to kill anything within it. It will not harm anything you have in the container but the manufacturer does suggest if you have any leather clothing to keep the strip off the fabric directly and to lay it on something else within the container.
Nuvan ProStrips will treat all parts of anything that are contained with the sealed container they are placed in. That would include the pages of books.