You can use clear adhesive sheet (don't know the name in english, "laminated", I think?), and make the rulebooks covers sturdier. It's what I did and no problem so far. I also laminated the reference sheets.
Ah, a retro-Blue Peter moment, memories of "Sticky back plastic'".
Copy shops often offer lamination services (and home laminators are available).
I put mine in an A4 display book.