I've used glue (OK but can come unstuck after a while) or sewing through just the fabric at the corners (OK on small pieces, but not suitable for large pieces).
Of the two, I think I prefer the sewing at the corners as this is unlikely to come undone over time and the papers can be removed without having to unpick the stitches. Compared to sewing through the fabric and paper, it might not save much time at the start, but removing the papers is much quicker.