Place a piece of wax paper under the area of the book on which you are working.
Apply liquid plastic adhesive to the entire torn edge of the page with a mending stick. You can purchase liquid plastic adhesive and mending sticks at an arts and crafts store.
Align the two sides of the tear, being careful that you lap the paper correctly and that you properly align letters in the page. Place another piece of waxed paper on top of the page and smooth it with a small, heavy flat object such as a paperweight.
Repeat steps 1 to 3 for any other torn pages in the book. Close the book and place a few rubber bands around it. Set it aside to dry for a few hours before putting the book to use.