Lacking Natural Simplicity

Non-Stop, by Brian W. Aldiss, Copyright 1958, 1959, 1987 by Brian W. Aldiss; Carroll & Graf, 1989; bookclub edition.

This was actually homework for a Metamorphosis Alpha game I intend to play with the kids, but quite enjoyable. I thought I might have read it before, but I certainly didn't remember any of it. (Did I read it as a kid myself? Quite possible.)

Now I need to find more generation ship novels and movies. Any suggestions?