Most people staple the books in the upper left corner (see image #1 below).
Some people cut the pages in half and staple them together (see image #2 below) -- this requires a heavy-duty stapler that can staple 20 or more pages.
If you want to cut the pages in half and don't have a heavy-duty stapler, you can punch a hole in the upper left corner and tie the pages together with a ribbon (see image #3 below).
